Jet Admin - Build business apps really fast
Redsmin - All-in-One GUI for Redis. Thightly crafted developer oriented, online real-time monitoring and administration service for Redis.
Retool - Build custom internal tools in minutes.
usql - Universal command-line interface for SQL databases
CodeQuest - Mini-games that intro kids to HTML and web development
Errbit - The open source error catcher that's Airbrake API compliant