LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Revizto - Revizto is an integrated BIM collaboration software platform that gives owners, designers, contractors, and facility managers the essential tools to streamline the building design and permitting process.
SketchUp - 3D for Everyone
Fonn - Fonn is a cloud-based solution designed to increase productivity and profitability on construction sites.
FreeCAD - An open-source parametric 3D modeler
VisualARQ - VisualARQ is a commercial architectural BIM software that works as a plugin for the Rhinoceros CAD application.