Mantis Bug Tracker is a free and open source, web-based bug tracking system. The most common use of MantisBT is to track software defects.
License: Open Source
Mantis Bug Tracker excels in straightforward issue tracking and is best suited for smaller projects or teams needing a simple tool for bug management. YouTrack, however, offers a multifaceted project management experience, including Agile support and extensive reporting features, making it more suitable for larger and more complex projects.