Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Snare - Snare is well known historically as a leader in the event log space.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
Beyond Compare - Beyond Compare allows you to compare files and folders.