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.
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.
A network IDS and IPS engine.
A MS Excel spreadsheet component for Android.