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.

Summit - Summit delivers news that matters to you, but with a twist. As a news aggregation software, breaking stories are collected, summarized and visually grafted into interesting infographics to keep you updated on current events while on-the-go.

Rollbar - Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them. Ruby, Python, PHP, Node.js, JavaScript, and Flash libraries available.

Tictoc - Learn More

RootCause - Record, Replay and Reproduce JavaScript Errors

The Sociable - Documenting how technology transforms societies