Free and Open Source Invoicing, Expenses & Time-Tracking
Kimai is a web-based multi-user time-tracking application
Accounting & Best Practice Business Administration System
Profesionalna integracja z Krajowym Systemem e-Faktur (KSeF)
A complete invoice managment solution for Elastix PBX
Free web-based invoicing primarily for Finnish companies
Keep track of all your job costs, make sure you don't lose money