Django-CRM / Django-CRM

BottleCRM: free, open-source (MIT) CRM with sales, support tickets and invoicing in one app. Unlimited users; self-host or use the hosted app.

VonHoltenCodes / SlowBooks-Pro-2026

Free, source-available accounting: double-entry bookkeeping, invoicing, US payroll, inventory, bank feeds - desktop app with built-in multi-user Server Edition (no Docker needed). A QuickBooks replacement. No cloud, no caps.

DRYTRIX / TimeTracker

Self-hosted time tracking & invoicing for freelancers and teams: timers, projects, PDF and Peppol e-invoicing. Open-source Toggl/Clockify alternative.

palavogikos-collab / myDATA

Issue Greek invoices via AADE timologio, get the MARK, keep one JSON per invoice, sync to your ERP (SAP B1 today; SoftOne, Pylon, Megasoft wanted). Claude skill, not a ΥΠΑΗΕΣ.