ITM Platform - Cloud-based Project Management Solutions
TurboSquid - TurboSquid offers 3D models for professionals.
Planisware - Planisware PPM software supports NPD and R+D processes to help organizations make confident business decisions.
3DOcean - 3D Models & Accessories From $1 for 3D Models, Textures, Materials & Shaders, 2D Concepts...
Workfront - Award winning project management software helps you manage projects in one place. A cloud-based work management tool for marketing and IT teams.
STLFinder - The 3d models search engine.