Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
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Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
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