"MakerBot Print is free software that optimizes and streamlines the 3D printing process for any workflow. It allows you to discover, prepare, manage, and share 3D prints."-- website
"Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation." -- website
"Direct3D is a low-level API that you can use to draw triangles, lines, or points per frame, or to start highly parallel operations on the GPU." -- website
"Do you need to clean up a 3D scan, do some 3D printing, or design an object that fits something else? Meshmixer can help. Think of it as a sort of "Swiss Army Knife" for 3D meshes." -- website
"MeshLab the open source system for processing and editing 3D triangular meshes. It provides a set of tools for editing, cleaning, healing, inspecting, rendering, texturing and converting meshes. It offers features for processing raw data produced by 3D digitization tools/devices and for preparing models for 3D printing."
"Use the Microsoft 3D Tools powered by Windows 10 APIs to fix 3D files automatically. Like a spellchecker, these tools will save you time by taking care of common errors in 3D files that otherwise would require manual fixing by a dedicated designer." -- website