CoLab3D

CoLab3D is a free, lightweight CAD collaboration tool. Users import STEP or OBJ files, annotate them with dimensions or text notes, and share a link with teammates. In-view chat allows real-time discussion while rotating the 3D model. The system supports section views to inspect internal geometry. With minimal modeling features, CoLab3D excels at team reviews or minor edits. It suits smaller engineering teams needing a free environment to review parts together without installing heavy software.