- [Actual](https://actualbudget.org) - Local-first personal finance tool based on zero-sum budgeting, supporting synchronization across devices, custom rules, manual transaction importing (from QIF, OFX, and QFX files), and optional automatic synchronization with many banks. ([Source Code](https://github.com/actualbudget/actual)) `MIT``Nodejs/Docker`
- [Bigcapital](https://bigcapital.app/) - Financial accounting and inventory management software for small to medium businesses. ([Source Code](https://github.com/bigcapitalhq/bigcapital)) `AGPL-3.0``Docker`
- [BeeCount](https://github.com/TNT-Likely/BeeCount) - Privacy-first personal accounting app with self-hosted sync (Supabase/WebDAV). Supports iOS/Android, multi-ledger management, chart analysis, and import from Alipay/WeChat. `MIT``Flutter`
- [Bitcart](https://bitcart.ai) - Cryptocurrencies payment processor and development platform. ([Demo](https://admin.bitcart.ai), [Source Code](https://github.com/bitcart/bitcart)) `MIT``Docker/Python/Nodejs`
- [BTCPay Server](https://btcpayserver.org/) - Bitcoin and other cryptocurrencies payment processor. ([Demo](https://mainnet.demo.btcpayserver.org/), [Source Code](https://github.com/btcpayserver/btcpayserver)) `MIT``C#`
- [DePay](https://depay.com) - Accept Web3 Payments directly into your wallet. Peer-to-peer, free, self-hosted & open-source. ([Demo](https://depay.com/products/payments), [Source Code](https://github.com/depayfi/widgets)) `MIT``Nodejs`