BlueScreenView - Displays information about blue screen crashes occured on your system. (MiniDump Reader)

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.

Doctor Dump - Doctor Dump is a free crash reporting and memory dump analyzing service.

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