PENTA - A free and beautiful business bank account in Germany 😍🇩🇪
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
Mercury - Mercury is banking* for startups
Synder - AR Automation
DingoDot - You and your accountant hate the bills, but I love them!
Xero - Xero is online accounting for your small business.