Klopt
AlphaKlopt is a truly open source double-entry bookkeeping system for SMEs up to Enterprise that is comparable in features to the incumbents. It’s aimed at the Dutch market (for now) and has bank feeds, VAT returns, invoicing and audit-ready reporting. Klopt is API-first, MCP included and keyboard-first. Check the alpha release on GitHub today and expect a stable release in Q1 2027.