WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
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.
Beyond Compare - Beyond Compare allows you to compare files and folders.
RabbitMQ - RabbitMQ is an open source message broker software.