JFS Accounting, Fribok, is a project for a free accounting software developed in Java. This accounting software includes the cycles of sale, purchasing, inventory and accounting.
It is great to have invoicing and accountant program perfect for swedish companies (SIE export/import) that works in Linux. That it works under "all" modern desktop OS is great. I bought it when it was commercial in 2008 and me and my wife still use it :) It is nice to see development continues and we will soon test the new version.
It's useful if you live in Sweden and have fskatt. I managed to enter 30 or so transactions and produce a SIE file for my accountant with it. Looking forward to a proper release.