Akaunting
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Akaunting is free, open-source accounting software that you can run on your own server or use through their hosted cloud version. It includes invoicing, expense tracking, double-entry accounting, and support for managing multiple companies from one installation.
It appeals to technically minded business owners, developers, and small agencies that want the flexibility to modify the software or host it themselves. Because it's open-source, you own the code, you can audit how it works, and you're not locked into a vendor's feature roadmap or pricing changes.