TopMod

Quote from the TopMod website:

TopMod3d is a free, open source, portable, platform independent topological mesh modeling system that allows users to create high genus 2-manifold (watertight) meshes.

Visit the TopMod website for more details including where to download. Use the link above to locate how to install a Linux version.  Definitely a good companion application with Blender for specific modeling tasks.

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