GraphQL Playground - GraphQL IDE for better development workflows
Redsmin - All-in-One GUI for Redis. Thightly crafted developer oriented, online real-time monitoring and administration service for Redis.
How to GraphQL - Open-source tutorial website to learn GraphQL development
usql - Universal command-line interface for SQL databases
Hasura - Hasura is an open platform to build scalable app backends, offering a built-in database, search, user-management and more.
Errbit - The open source error catcher that's Airbrake API compliant