MatterControl
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3. MatterControl
And MatterControl for Linux is a Free, Open-Source, All-in-One Software package that lets you Design, Slice, Organize, and Manage your 3D Prints.
Furthermore, with MatterControl, you can Design your Parts from Scratch using the Design Tools, or Visit the Design Apps to Browse Existing Projects.
How to Install MatterControl on GNU/Linux Desktops
MatterControl Installation Guide