Mantis

Mantis is a PHP/MySQL-based bugtracking system.

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Developer: Kenzaburo Ito
License: GNU General Public License (GPL)
Operating System: OS Independent (Written in an interpreted language)

Mantis Effort is a freeware open source project.

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Developer: Viktor Kruglikov
License: GNU General Public License (GPL)
Operating System: All

Mantis is a PHP/MySQL-driven web based bugtracking system.

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Developer: Kenzaburo Ito
License: Freeware
Operating System: any

Ants is a free, web-based and open source Applicant tracking system based on Mantis* and t is released under the terms of the GNU General Public License (GPL).

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Developer: ATS
License: GNU General Public License (GPL)
Operating System: All