open source

[noiram]

mantis is under GPL. It means that it is free.
Is Mantis also open source ?

Noiram

[Kirill]

Yes. http://git.mantisforge.org

[vboctor]

MantisBT source code can be found @ http://git.mantisbt.org
MantisBT plugins can be found @ http://git.mantisforge.org

[Kirill]

MantisBT source code can be found @ http://git.mantisbt.org

MantisBT source code can be found and @ http://git.mantisforge.org. This sync repo.

[vboctor]

The official repo is on git.mantisbt.org. There are multiple on git.mantisforge.org to allow developers / contributors to do group work without checking in to the official repo. Hence, it is easier to point to the official one.

Also since this is a PHP project, the source code is part of the download anyway.