Version : 2.26.0
Votes : 52
MantisBT is a free popular web-based bugtracking system. It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a webserver. MantisBT can be installed on Windows, Linux, Mac OS, OS/2, and others. Almost any web browser should be able to function as a client.
The documentation is easy to understand, it's an efficient tool for tracking bugs and also for software versioning. It's easy to extend it according to your needs, there are some great (free) plugins like agileMantis you can use if you want more advanced bug management.