The ea-Geier is a tool that handles accounting on a cash basis for Austrian companies (Buchhaltung zur Einnahmen-Ausgaben-Rechnung). With modular accounts code and a multi-lingual design, it is easily adjustable for other countries. It allows you to book and administrate your incomes and expenditures, manage assets (depreciation for wear and tear), your purchased goods intended for resale, and travel expenses.
IM-Filter is a daemon that runs on a firewall and filters ICQ traffic. The daemon can identify file transfers, handle UIN and word blacklists, manage a list with currently logged in users, and log messages sent via the ICQ protocol. The modular design allows implementation of other protocols like MSN or IRC.
jumpstart is a performance hack for Linux/x86 that runs an application with shared libraries already loaded. The executable file is started, then stopped after the runtime loader has mapped the shared libraries, but before any application code has run. Then the process acts as a server, reading command line arguments and environment via a named pipe, and executing the task in a fork()ed child.