Mantis Bug Tracker is described as 'Free and open source, web-based bug tracking 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' and is a popular Issue Tracking system in the development category. There are more than 50 alternatives to Mantis Bug Tracker for a variety of platforms, including Web-based, Windows, Linux, Self-Hosted and Mac apps. The best Mantis Bug Tracker alternative is GitHub, which is free. Other great apps like Mantis Bug Tracker are Redmine, JIRA, OpenProject and Plane.