GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
TurboCASH - TurboCASH Accounting Free and Open Source Accounting Software for Small to Medium Business.
MoneyMoney - Alle Bankkonten im Blick mit MoneyMoney. Finden Sie heraus, wo Ihr Geld herkommt und wo es hingeht.
KMyMoney - KMyMoney is a personal finance manager for KDE.
Xero - Xero is online accounting for your small business.
GoDBLedger - GoDBLedger is an Open Source Accounting System that aims to provide the user with normal programming goodies that finance systems tend to lack. It includes GRPC endpoints and a MySQL database backend so you can actually analyse your financial data.