Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
RabbitMQ - RabbitMQ is an open source message broker software.