Open source Accounting software for Windows

ATOS

ATOS is every freelancer's one-stop shop for managing clients, projects, and your taxes. Whether you're selling time-based sprints, or simply tracking time worked, ATOS allows you to manage multiple projects for multiple clients at once, all while generating beautiful invoices and helping you with your estimated taxes in the process. (AGPL)

Cross-platform

FrontAccounting

FrontAccounting (FA) is a professional web-based Accounting system for the entire ERP chain written in PHP, using MySQL. FA is multilingual and multicurrency. (GPL)

Cross-platform

GnuCash

GnuCash is personal and small-business financial-accounting software, freely licensed under the GNU GPL. (GPL)

Linux - FreeBSD - Windows - MAC OS X

osFinancials

osFinancials is Accounting software targeted to the Small and Medium sized Businesses (SMB) and build around the needs of the osFinancials community. (GPL)

Windows

Rabio

Rapid Business Information Organizer (or Rabio) is an open-source budgeting software designed to organize projects and control their financial activities like budget, costs, earned value, forecast, projection, etc. User take control of budget and costs using Rabio with the flexible Cost Breakdown Structure (CBS) of cost centers, cost categories, and the addition of tags. (GPL)

Cross-platform

5 applications