FreeCAD - An open-source parametric 3D modeler
Procore - Procore is the world's most widely used construction project management software. Easy to use, mobile platform with unlimited user licenses.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Fieldwire - The construction app for project and task management in the field.
Onshape - Onshape is the first full-cloud 3D CAD system. It runs in a web browser and on any mobile device.
Bluebeam Revu - The end-to-end digital workflow and collaboration solution trusted by over 1 million AEC professionals worldwide. Revu delivers award-winning PDF creation, editing, markup and collaboration technology designed for AEC workflows.