WhoCrashed - WhoCrashed reveals the drivers responsible for crashing your computer.

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.

WhatIsHang - Get information about hanging/freezing (stopped responding) Windows program.

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.

WinDbg - WinDbg is a multipurposed debugger for Microsoft Windows, distributed on the web by Microsoft as...

ErrorFeed - Error tracking and exception handling for developers, startups, and freelancers.