Open PostgreSQL Monitoring - Oversee and Manage Your PostgreSQL Servers
Jet Admin - Build business apps really fast
Errbit - The open source error catcher that's Airbrake API compliant
Retool - Build custom internal tools in minutes.
Redsmin - All-in-One GUI for Redis. Thightly crafted developer oriented, online real-time monitoring and administration service for Redis.
Appsmith - Appsmith is an open source web framework for building internal tools, admin panels, dashboards, and workflows.