For open source Mantis, the official website is http://www.mantis.org.cn/; http://www.mantisbt.org/.
Some basic introduction to the system is as follows:
Defect management platform Mantis, also known as MantisBT, full name Mantis Bug Tracker.
Mantis is a lightweight open source defect tracking system based on PHP technology, which provides project management and defect tracking services in the form of web operations. In terms of functionality and practicality, it is sufficient to meet the management and tracking of small and medium-sized projects. What's more important is that it is open source and does not require any cost.
Mantis is a defect tracking system with multiple features including: easy to install, easy to operate, web-based, supports any platform that can run PHP (Windows, Linux, Mac, Solaris, AS400/i5, etc.), has been translated into 68 languages, supports multiple projects, sets different user access levels for each project, tracks defect change history, customizes my view page, provides full-text search function, built-in report generation function (including graphical reports), reports defects via email, Users can monitor special bugs, attachments can be saved on the web server or database (can also be backed up to an FTP server), customize defect processing workflow, support output formats including csv, Microsoft Excel, Microsoft Word, integrated source code control (SVN and CVS), integrates wiki knowledge base and chat tools (optional/optional), supports multiple databases (MySQL, MSSQL, PostgreSQL, Oracle, DB2), provides WebService (SOAP) interface, and provides Wap access.