Graphite is an in-development raster and vector graphics package that's free and open source. It is powered by a node graph compositing engine that fuses layers with nodes, providing a fully nondestructive editing experience. https://graphite.rs/
OSAFE Workbench (FreeCAD addon) https://github.com/ebrahimraeyat/OSAFE
The OSAFE workbench by Ebrahim Raeyat. This FreeCAD Addon is a collection of civil engineering tools, originally designed as a workaround for issues with CSI SAFE. The addon is available via the regular Addon Manager.
GPL-V3
Just reviewing this thread regarding OS and Free software. Although not specifically AEC software but for myself and others that plan to record video tutorials and post edit, Blackmagic offers a world class video editing application called Davinci Resolve. Fantastic application and very open community.
Comments
CFAST, MAYO, LEKAN, DESIGN added to Software directory wiki.
Open-Infra-Platform
https://github.com/tumcms/Open-Infra-Platform
IFC viewer.
GPL-V3
Blender Earth Modeler Add-on | 3D Google Earth (City/Terrain) inside Blender

Graphite is an in-development raster and vector graphics package that's free and open source. It is powered by a node graph compositing engine that fuses layers with nodes, providing a fully nondestructive editing experience.
https://graphite.rs/
OSAFE Workbench (FreeCAD addon)
https://github.com/ebrahimraeyat/OSAFE
The OSAFE workbench by Ebrahim Raeyat. This FreeCAD Addon is a collection of civil engineering tools, originally designed as a workaround for issues with CSI SAFE. The addon is available via the regular Addon Manager.
GPL-V3
SOLARIUM
https://github.com/elschilling/solarium
Open Source software to host and share sun path visualizations.
https://wvsolarium.vercel.app/
GPL-V3
Just reviewing this thread regarding OS and Free software. Although not specifically AEC software but for myself and others that plan to record video tutorials and post edit, Blackmagic offers a world class video editing application called Davinci Resolve. Fantastic application and very open community.