vmm is an easy-to-use and configurable commandline tool for administrators and postmasters, used to manage domains, alias-domains, accounts, and relocated mail users. It allows fast and easy management of mail servers. It's designed for installations using Dovecot and Postfix with a PostgreSQL backend.
moneyGuru is a personal finance management application. It allows you to evaluate your financial situation so that you can make informed (and thus better) decisions. Most finance applications have the same goal, but moneyGuru's difference is in the way it achieves it. Rather than having reports which you have to configure (or find out which pre-configured report is the right one), your important financial data (net worth, profit) is constantly up-to-date and "in your face". This allows you to constantly make informed decision rather than doing so periodically.
Calcurse is a text-based calendar and scheduling application. It helps keep track of events, appointments, and everyday tasks. A configurable notification system reminds the user of upcoming deadlines, and the curses based interface can be customized to suit user needs. All of the commands are documented within an online help system.