TrackJS JavaScript Error Logging - JavaScript Error Monitoring from TrackJS gives you context about what's happening in your end-users' browsers.
Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Bugfender - Cloud logging for your apps, not only crashes matter
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
Snare - Snare is well known historically as a leader in the event log space.