MantisBT is a free popular web-based bug tracking system. It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a web server.
Main features:
- Simple User Experience
- Web Based
- Supports any platform that runs PHP (Windows, Linux, Mac, Solaris, AS400/i5, etc)
- Available in 68 localizations.
- Customizable Issue Pages
- Multiple Projects per instance
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