Free plug-in for Rhinoceros and Grasshopper - parametric 3D multizone building definition - combined thermal and daylight simulation - TRNSYS18

Trims a mesh at a plane then mirrors it over the plane and stitches the original + mirrored meshes together into one new clean symmetrical mesh.

ThePipe is a platform intended to provide real-time geometry exchange between design and modeling applications.

ParaStaad is a grasshopper plug-in for professional structural analysis & interoperability linking Rhino/Grasshopper with StaadPro.

Sweep made easier and more advanced

Flatworm is a python module and GHPython implementation for generating rigidly foldable quadrilateral meshes (RFQM) in Grasshopper.

A collection of useful tools (some more some less so). I will be updating this as I continue to add new components.

BIM Equivalent for Architectural Design using Bamboo as a Primary Material