_See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https://en.wikipedia.org/wiki/Comparison_of_CalDAV_and_CardDAV_implementations)_
_See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https://en.wikipedia.org/wiki/Comparison_of_CalDAV_and_CardDAV_implementations)_
- [Baïkal](https://sabre.io/baikal/) - Lightweight CalDAV and CardDAV server based on sabre/dav. ([Source Code](https://github.com/sabre-io/Baikal)) `GPL-3.0``PHP`
- [Baïkal](https://sabre.io/baikal/) - Lightweight CalDAV and CardDAV server based on sabre/dav. ([Source Code](https://github.com/sabre-io/Baikal)) `GPL-3.0``PHP`
- [calypso](https://keithp.com/calypso/) - Python-based CalDAV and CardDAV server, forked from Radicale. ([Source Code](https://keithp.com/cgit/)) `GPL-3.0``Python`
- [calypso](https://keithp.com/calypso/) - Python-based CalDAV and CardDAV server (fork of Radicale). ([Source Code](https://keithp.com/cgit/)) `GPL-3.0``Python`
- [DAViCal](https://www.davical.org/) - Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. ([Source Code](https://gitlab.com/davical-project/davical)) `GPL-2.0``PHP`
- [DAViCal](https://www.davical.org/) - Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. ([Source Code](https://gitlab.com/davical-project/davical)) `GPL-2.0``PHP`
- [Davis](https://github.com/tchapi/davis) - A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal. `MIT``PHP`
- [Davis](https://github.com/tchapi/davis) - A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal. `MIT``PHP`
- [Etebase (EteSync)](https://www.etebase.com/) - End-to-end encrypted and journaled personal information server supporting calendar and contact data, offering its own clients. ([Source Code](https://github.com/etesync/server)) `AGPL-3.0``Python/Django`
- [Etebase (EteSync)](https://www.etebase.com/) - End-to-end encrypted and journaled personal information server supporting calendar and contact data, offering its own clients. ([Source Code](https://github.com/etesync/server)) `AGPL-3.0``Python/Django`
@ -474,7 +474,7 @@ Simple deployment of [E-mail](https://en.wikipedia.org/wiki/Email) servers, e.g.
- [IMP](https://www.horde.org/apps/imp/) - HORDE application that provides webmail access to IMAP and POP3 accounts. ([Demo](http://demo.horde.org/), [Source Code](https://www.horde.org/download/imp)) `GPL-2.0``PHP`
- [IMP](https://www.horde.org/apps/imp/) - HORDE application that provides webmail access to IMAP and POP3 accounts. ([Demo](http://demo.horde.org/), [Source Code](https://www.horde.org/download/imp)) `GPL-2.0``PHP`
- [Roundcube](https://roundcube.net) - Browser-based IMAP client with an application-like user interface. ([Source Code](https://github.com/roundcube/roundcubemail)) `GPL-3.0``PHP`
- [Roundcube](https://roundcube.net) - Browser-based IMAP client with an application-like user interface. ([Source Code](https://github.com/roundcube/roundcubemail)) `GPL-3.0``PHP`
- [SnappyMail](https://snappymail.eu/) - Simple, modern, lightweight & fast web-based email client. (It is an actively developed fork of RainLoop). ([Demo](https://snappymail.eu/demo/), [Source Code](https://github.com/the-djmaze/snappymail)) `AGPL-3.0``PHP`
- [SnappyMail](https://snappymail.eu/) - Simple, modern, lightweight & fast web-based email client (fork of RainLoop). ([Demo](https://snappymail.eu/demo/), [Source Code](https://github.com/the-djmaze/snappymail)) `AGPL-3.0``PHP`
- [SquirrelMail](https://squirrelmail.org) - Another browser-based IMAP client. ([Source Code](https://sourceforge.net/p/squirrelmail/code/HEAD/tree/)) `GPL-2.0``PHP`
- [SquirrelMail](https://squirrelmail.org) - Another browser-based IMAP client. ([Source Code](https://sourceforge.net/p/squirrelmail/code/HEAD/tree/)) `GPL-2.0``PHP`
- [jackal](https://github.com/ortuman/jackal) - XMPP server with focus on stability, simple configuration and low resource consumption. `Apache-2.0``Go/Docker`
- [jackal](https://github.com/ortuman/jackal) - XMPP server with focus on stability, simple configuration and low resource consumption. `Apache-2.0``Go/Docker`
- [Metronome IM](https://metronome.im/) - Fork of Prosody IM. ([Source Code](https://github.com/maranda/metronome)) `MIT``Lua`
- [Metronome IM](https://metronome.im/) - Lightweight xmpp server with advanced microblogging features (fork of Prosody). ([Source Code](https://github.com/maranda/metronome)) `MIT``Lua`
- [MongooseIM](https://www.erlang-solutions.com/products/mongooseim.html) - Mobile messaging platform with a focus on performance and scalability. ([Source Code](https://github.com/esl/MongooseIM)) `GPL-2.0``Erlang/Docker/K8S`
- [MongooseIM](https://www.erlang-solutions.com/products/mongooseim.html) - Mobile messaging platform with a focus on performance and scalability. ([Source Code](https://github.com/esl/MongooseIM)) `GPL-2.0``Erlang/Docker/K8S`
- [Openfire](https://www.igniterealtime.org/projects/openfire/) - Real time collaboration (RTC) server. ([Source Code](https://github.com/igniterealtime/Openfire)) `Apache-2.0``Java`
- [Openfire](https://www.igniterealtime.org/projects/openfire/) - Real time collaboration (RTC) server. ([Source Code](https://github.com/igniterealtime/Openfire)) `Apache-2.0``Java`
- [Prosody IM](https://prosody.im/) - Feature-rich and easy to configure XMPP server. ([Source Code](https://hg.prosody.im/)) `MIT``Lua`
- [Prosody IM](https://prosody.im/) - Feature-rich and easy to configure XMPP server. ([Source Code](https://hg.prosody.im/)) `MIT``Lua`
@ -763,7 +763,7 @@ A [document management system](https://en.wikipedia.org/wiki/Document_management
- [EveryDocs](https://github.com/jonashellmann/everydocs-core) - A simple Document Management System for private use with basic functionality to organize your documents digitally. `GPL-3.0``Docker/Ruby`
- [EveryDocs](https://github.com/jonashellmann/everydocs-core) - A simple Document Management System for private use with basic functionality to organize your documents digitally. `GPL-3.0``Docker/Ruby`
- [I, Librarian](https://i-librarian.net) - I, Librarian can organize PDF papers and office documents. It provides a lot of extra features for students and research groups both in industry and academia. ([Demo](https://i-librarian.net/demo/), [Source Code](https://github.com/mkucej/i-librarian-free)) `GPL-3.0``PHP`
- [I, Librarian](https://i-librarian.net) - I, Librarian can organize PDF papers and office documents. It provides a lot of extra features for students and research groups both in industry and academia. ([Demo](https://i-librarian.net/demo/), [Source Code](https://github.com/mkucej/i-librarian-free)) `GPL-3.0``PHP`
- [Mayan EDMS](https://www.mayan-edms.com) - Free Open Source Electronic Document Management System. An electronic vault for your documents with preview generation, OCR, and automatic categorization among other features. ([Source Code](https://gitlab.com/mayan-edms/mayan-edms)) `Apache-2.0``Python`
- [Mayan EDMS](https://www.mayan-edms.com) - Free Open Source Electronic Document Management System. An electronic vault for your documents with preview generation, OCR, and automatic categorization among other features. ([Source Code](https://gitlab.com/mayan-edms/mayan-edms)) `Apache-2.0``Python`
- [Paperless-ngx](https://docs.paperless-ngx.com/) - A fork of paperless, adding a new interface and many other changes under the hood. Scan, index, and archive all of your paper documents. ([Demo](https://demo.paperless-ngx.com/), [Source Code](https://github.com/paperless-ngx/paperless-ngx)) `GPL-3.0``Python/Docker`
- [Paperless-ngx](https://docs.paperless-ngx.com/) - Scan, index, and archive all of your paper documents with an imporved interface (fork of Paperless). ([Demo](https://demo.paperless-ngx.com/), [Source Code](https://github.com/paperless-ngx/paperless-ngx)) `GPL-3.0``Python/Docker`
- [Papermerge](https://papermerge.com) - Open Source Document Management System focused on scanned documents (electronic archives). Features file browsing in similar way to dropbox/google drive. OCR, full text search, text overlay/selection. ([Source Code](https://github.com/ciur/papermerge)) `Apache-2.0``Python/Docker/K8S`
- [Papermerge](https://papermerge.com) - Open Source Document Management System focused on scanned documents (electronic archives). Features file browsing in similar way to dropbox/google drive. OCR, full text search, text overlay/selection. ([Source Code](https://github.com/ciur/papermerge)) `Apache-2.0``Python/Docker/K8S`
- [paper{s}pace](https://dedicatedcode.com/projects.html) - Small web application to manage all your offline documents. Provides a searchable storage for your documents and reminds you of upcoming tasks. ([Source Code](https://gitlab.com/dedicatedcode/paperspace)) `MIT``Java`
- [paper{s}pace](https://dedicatedcode.com/projects.html) - Small web application to manage all your offline documents. Provides a searchable storage for your documents and reminds you of upcoming tasks. ([Source Code](https://gitlab.com/dedicatedcode/paperspace)) `MIT``Java`
- [Stirling-PDF](https://github.com/Frooodle/Stirling-PDF) - Local hosted web application that allows you to perform various operations on PDF files, such as merging, splitting, file conversions and OCR. `Apache-2.0``Docker/Java`
- [Stirling-PDF](https://github.com/Frooodle/Stirling-PDF) - Local hosted web application that allows you to perform various operations on PDF files, such as merging, splitting, file conversions and OCR. `Apache-2.0``Docker/Java`
@ -964,7 +964,7 @@ Simplified file servers for sharing of one-time/short-lived/temporary files, pro
- [Jirafeau](https://gitlab.com/mojo42/Jirafeau) - Jirafeau is a web site permitting to upload a file in a simple way and give an unique link to it. ([Demo](https://jirafeau.net/)) `AGPL-3.0``PHP`
- [Jirafeau](https://gitlab.com/mojo42/Jirafeau) - Jirafeau is a web site permitting to upload a file in a simple way and give an unique link to it. ([Demo](https://jirafeau.net/)) `AGPL-3.0``PHP`
- [OnionShare](https://github.com/onionshare/onionshare) - Securely and anonymously share a file of any size. `GPL-2.0``Python`
- [OnionShare](https://github.com/onionshare/onionshare) - Securely and anonymously share a file of any size. `GPL-2.0``Python`
- [Pairdrop](https://github.com/schlagmichdoch/pairdrop) - Local file sharing in your browser. Inspired by Apple's AirDrop. Fork of Snapdrop. `GPL-3.0``Docker`
- [Pairdrop](https://github.com/schlagmichdoch/pairdrop) - Local file sharing in your browser, inspired by Apple's AirDrop (fork of Snapdrop). `GPL-3.0``Docker`
- [PicoShare](https://pico.rocks) - A minimalist, easy-to-host service for sharing images and other files. ([Demo](https://demo.pico.rocks), [Source Code](https://github.com/mtlynch/picoshare)) `AGPL-3.0``Go`
- [PicoShare](https://pico.rocks) - A minimalist, easy-to-host service for sharing images and other files. ([Demo](https://demo.pico.rocks), [Source Code](https://github.com/mtlynch/picoshare)) `AGPL-3.0``Go`
- [Picsur](https://github.com/CaramelFur/Picsur) - A simple imaging hosting playtfom that allows you to easily host, edit, and share images. `GPL-3.0``Docker`
- [Picsur](https://github.com/CaramelFur/Picsur) - A simple imaging hosting playtfom that allows you to easily host, edit, and share images. `GPL-3.0``Docker`
- [PictShare](https://www.pictshare.net/) - PictShare is a multi lingual, open source image hosting service with a simple resizing and upload API. ([Source Code](https://github.com/HaschekSolutions/pictshare)) `Apache-2.0``PHP`
- [PictShare](https://www.pictshare.net/) - PictShare is a multi lingual, open source image hosting service with a simple resizing and upload API. ([Source Code](https://github.com/HaschekSolutions/pictshare)) `Apache-2.0``PHP`
@ -1333,7 +1333,7 @@ Software that does not fit in another section.
- [graph-vl](https://github.com/verifid/graph-vl) - Identity document verification using Machine Learning and GraphQL. `MIT``Python`
- [graph-vl](https://github.com/verifid/graph-vl) - Identity document verification using Machine Learning and GraphQL. `MIT``Python`
- [Habitica](https://habitica.com/) - Habit tracker app which treats your goals like a Role Playing Game. Previously called HabitRPG. ([Source Code](https://github.com/HabitRPG/habitica)) `GPL-3.0/CC-BY-SA-3.0``Nodejs`
- [Habitica](https://habitica.com/) - Habit tracker app which treats your goals like a Role Playing Game. Previously called HabitRPG. ([Source Code](https://github.com/HabitRPG/habitica)) `GPL-3.0/CC-BY-SA-3.0``Nodejs`
- [IconCaptcha](https://www.fabianwennink.nl/projects/IconCaptcha/) - IconCaptcha is a self-hosted, fast, simple and user-friendly captcha for PHP. ([Source Code](https://github.com/fabianwennink/IconCaptcha-Plugin-jQuery-PHP)) `MIT``PHP`
- [IconCaptcha](https://www.fabianwennink.nl/projects/IconCaptcha/) - IconCaptcha is a self-hosted, fast, simple and user-friendly captcha for PHP. ([Source Code](https://github.com/fabianwennink/IconCaptcha-Plugin-jQuery-PHP)) `MIT``PHP`
- [Jellyseerr](https://github.com/Fallenbagel/jellyseerr) - A free and open source software application for managing requests for your media library. It is a a fork of Overseerr built to bring support for Jellyfin & Emby media servers. `MIT``Docker`
- [Jellyseerr](https://github.com/Fallenbagel/jellyseerr) - Manage requests for your media library, supports Plex, Jellyfin and Emby media servers (fork of Overseerr). `MIT``Docker`
- [Journal](https://github.com/inoda/journal) - Simple journaling with encrypted entries and sharing capabilities. `MIT``Ruby`
- [Journal](https://github.com/inoda/journal) - Simple journaling with encrypted entries and sharing capabilities. `MIT``Ruby`
- [Kasm Workspaces](https://kasmweb.com/) - Streaming containerized apps and desktops to end-users. Examples include Ubuntu in your browser, or simply single apps such as Chrome, OpenOffice, Gimp, Filezilla etc. ([Demo](https://www.kasmweb.com/#demo), [Source Code](https://github.com/kasmtech)) `GPL-3.0``Docker`
- [Kasm Workspaces](https://kasmweb.com/) - Streaming containerized apps and desktops to end-users. Examples include Ubuntu in your browser, or simply single apps such as Chrome, OpenOffice, Gimp, Filezilla etc. ([Demo](https://www.kasmweb.com/#demo), [Source Code](https://github.com/kasmtech)) `GPL-3.0``Docker`
- [King Phisher](https://github.com/rsmusllp/king-phisher) - King Phisher is a tool for testing and promoting user awareness by simulating real world phishing attacks. `BSD-3-Clause``Python`
- [King Phisher](https://github.com/rsmusllp/king-phisher) - King Phisher is a tool for testing and promoting user awareness by simulating real world phishing attacks. `BSD-3-Clause``Python`
@ -1726,7 +1726,7 @@ A [search engine](https://en.wikipedia.org/wiki/Search_engine_(computing)) is an
- [SearXNG](https://docs.searxng.org/) `⚠` - Internet metasearch engine which aggregates results from various search services and databases. (Fork of Searx). ([Source Code](https://github.com/searxng/searxng/)) `AGPL-3.0``Python/Docker`
- [SearXNG](https://docs.searxng.org/) `⚠` - Internet metasearch engine which aggregates results from various search services and databases (Fork of Searx). ([Source Code](https://github.com/searxng/searxng/)) `AGPL-3.0``Python/Docker`
- [sist2](https://github.com/simon987/sist2) - Lightning-fast file system indexer and search tool. `GPL-3.0``C`
- [sist2](https://github.com/simon987/sist2) - Lightning-fast file system indexer and search tool. `GPL-3.0``C`
- [Typesense](https://typesense.org) - Blazing fast, typo-tolerant open source search engine optimized for developer happiness and ease of use. ([Source Code](https://github.com/typesense/typesense)) `GPL-3.0``C++`
- [Typesense](https://typesense.org) - Blazing fast, typo-tolerant open source search engine optimized for developer happiness and ease of use. ([Source Code](https://github.com/typesense/typesense)) `GPL-3.0``C++`
- [Gerrit](https://www.gerritcodereview.com/) - A code review and project management tool for Git based projects. ([Source Code](https://github.com/GerritCodeReview/gerrit)) `Apache-2.0``Java/Docker`
- [Gerrit](https://www.gerritcodereview.com/) - A code review and project management tool for Git based projects. ([Source Code](https://github.com/GerritCodeReview/gerrit)) `Apache-2.0``Java/Docker`
- [Gitblit](https://www.gitblit.com/) - Pure Java stack for managing, viewing, and serving Git repositories. ([Source Code](https://github.com/gitblit-org/gitblit)) `Apache-2.0``Java`
- [Gitblit](https://www.gitblit.com/) - Pure Java stack for managing, viewing, and serving Git repositories. ([Source Code](https://github.com/gitblit-org/gitblit)) `Apache-2.0``Java`
- [Gitlist](https://gitlist.org/) - Web-based git repository browser - GitList allows you to browse repositories using your favorite browser, viewing files under different revisions, commit history and diffs. ([Source Code](https://github.com/klaussilveira/gitlist)) `BSD-3-Clause``PHP`
- [Gitlist](https://gitlist.org/) - Web-based git repository browser - GitList allows you to browse repositories using your favorite browser, viewing files under different revisions, commit history and diffs. ([Source Code](https://github.com/klaussilveira/gitlist)) `BSD-3-Clause``PHP`
- [Gitolite](https://gitolite.com/gitolite/index.html) - Gitolite allows you to setup git hosting on a central server, with fine-grained access control and many more powerful features. ([Source Code](https://github.com/sitaramc/gitolite)) `GPL-2.0``Perl`
- [Gitolite](https://gitolite.com/gitolite/index.html) - Gitolite allows you to setup git hosting on a central server, with fine-grained access control and many more powerful features. ([Source Code](https://github.com/sitaramc/gitolite)) `GPL-2.0``Perl`
@ -1972,7 +1972,7 @@ _Related: [Software Development - Project Management](#software-development---pr
- [AppFlowy](https://appflowy.io/) - With AppFlowy, you can build detailed lists of to-do’s for different projects while tracking the status of each one. Open Source Notion Alternative. ([Source Code](https://github.com/AppFlowy-IO/appflowy)) `AGPL-3.0``Rust/Dart/Docker`
- [AppFlowy](https://appflowy.io/) - With AppFlowy, you can build detailed lists of to-do’s for different projects while tracking the status of each one. Open Source Notion Alternative. ([Source Code](https://github.com/AppFlowy-IO/appflowy)) `AGPL-3.0``Rust/Dart/Docker`
- [Focalboard](https://www.focalboard.com/) - Define, organize, track and manage work across individuals and teams (alternative to Trello, Notion, and Asana). ([Source Code](https://github.com/mattermost/focalboard), [Clients](https://www.focalboard.com/download/personal-edition/desktop/)) `MIT/AGPL-3.0/Apache-2.0``Nodejs/Go`
- [Focalboard](https://www.focalboard.com/) - Define, organize, track and manage work across individuals and teams (alternative to Trello, Notion, and Asana). ([Source Code](https://github.com/mattermost/focalboard), [Clients](https://www.focalboard.com/download/personal-edition/desktop/)) `MIT/AGPL-3.0/Apache-2.0``Nodejs/Go`
- [Kanbana](https://github.com/SrGMC/kanbana) - Create boards to track users and projects from flat markdown files. Forked from Crepido. `MIT``Nodejs`
- [Kanbana](https://github.com/SrGMC/kanbana) - Create boards to track users and projects from flat markdown files (fork of Crepido). `MIT``Nodejs`
- [Kanboard](https://kanboard.org/) - Simple and open source visual task board. ([Source Code](https://github.com/kanboard/kanboard)) `MIT``PHP`
- [Kanboard](https://kanboard.org/) - Simple and open source visual task board. ([Source Code](https://github.com/kanboard/kanboard)) `MIT``PHP`
- [Minimalist Online Markdown Editor](http://markdown.pioul.fr) - The simplest and slickest online Markdown editor. ([Source Code](https://github.com/pioul/Minimalist-Online-Markdown-Editor)) `MIT``Nodejs`
- [Minimalist Online Markdown Editor](http://markdown.pioul.fr) - The simplest and slickest online Markdown editor. ([Source Code](https://github.com/pioul/Minimalist-Online-Markdown-Editor)) `MIT``Nodejs`
- [myTinyTodo](https://www.mytinytodo.net/) - Simple way to manage your todo list in AJAX style. Uses PHP, jQuery, SQLite/MySQL. GTD compliant. ([Demo](https://www.mytinytodo.net/demo/), [Source Code](https://github.com/maxpozdeev/mytinytodo/)) `GPL-2.0``PHP`
- [myTinyTodo](https://www.mytinytodo.net/) - Simple way to manage your todo list in AJAX style. Uses PHP, jQuery, SQLite/MySQL. GTD compliant. ([Demo](https://www.mytinytodo.net/demo/), [Source Code](https://github.com/maxpozdeev/mytinytodo/)) `GPL-2.0``PHP`