- [Easy!Appointments](https://easyappointments.org/) - A highly customizable web application that allows your customers to book appointments with you via the web. ([Demo](https://demo.easyappointments.org/), [Source Code](https://github.com/alextselegidis/easyappointments)) `GPL-3.0``PHP`
- [Hi.Events](https://hi.events) - Event management and ticketing platform for conferences, concerts, and more. Offering customizable event pages and embeddable ticket widgets. ([Demo](https://demo.hi.events/event/1/dog-conf-2030), [Source Code](https://github.com/HiEventsDev/hi.events)) `AGPL-3.0``Docker`
- [QloApps](https://qloapps.com/) - An open-source, customizable and intuitive web-based hotel reservation system and a booking engine. ([Demo](https://demo.qloapps.com/), [Source Code](https://github.com/webkul/hotelcommerce)) `OSL-3.0``PHP/Nodejs`
- [InvoicePlane](https://github.com/InvoicePlane/InvoicePlane) - Manage quotes, invoices, payments and customers for your small business. `MIT``PHP`
- [InvoiceShelf](https://invoiceshelf.com/) - A software that helps you track expenses, payments & create professional invoices & estimates (fork of Crater). ([Source Code](https://github.com/InvoiceShelf/InvoiceShelf)) `AGPL-3.0``PHP/Docker`
- [Kill Bill](https://killbill.io/) - Open-Source Subscription Billing & Payments Platform. Have access to real-time analytics and financial reports. ([Source Code](https://github.com/killbill/killbill)) `Apache-2.0``Java/Docker`
- [Kresus](https://kresus.org/) - Open source personal finance manager. ([Demo](https://kresus.org/en/demo.html), [Source Code](https://github.com/kresusapp/kresus)) `MIT``Nodejs/Docker`
- [Kresus](https://kresus.org/) - Open source personal finance manager. ([Demo](https://kresus.org/en/demo.html), [Source Code](https://github.com/kresusapp/kresus)) `AGPL-3.0``Nodejs/Docker`
- [Maybe](https://maybe.co/) - An OS for your personal finances built by a small team alongside an incredible community. ([Source Code](https://github.com/maybe-finance/maybe)) `AGPL-3.0``Docker`