JIRA

Help desk ticketing and project/issue tracker

Simple-to-use and -install issue tracking system with command-line, web, REST, XML-RPC, and e-mail...

Lightweight error tracker without a subscription

Marketing, sales, and customer service platform designed to help businesses attract more engaged...

Real-time error tracking for your applications with all the details in one place. Easy setup with...

Bug tracker, fits best for software development