Slic3r
From MatterControl Manual
Slic3r is a third-party slicing engine which has been integrated into MatterControl.
Origin
Slic3r was created in 2011 by members of the RepRap community.[1]
Documentation
The complete list of available Slic3r slice settings for use in MatterControl can be found on the Slic3r Settings page.
Repository
Slic3r is an open source project hosted on GitHub: https://github.com/alexrj/Slic3r
