LedgerSMB is an accounting and ERP framework which aims to provide solid accounting, industry-leading security, and support for rapid development of business tools re-using accounting logic to support workflows of any specific business.
L'ane (L'anePOS) is a point-of-sale (cash register) and backoffice program for retail businesses and restaurants written in Perl on Linux/Unix. It uses PostgreSQL for backend storage.
A 3D Rubik's cube game.
A probabilistic Java toolkit for building search engines.