Welcome to Permies!
Here is a discussion about using FreeCAD for permaculture design along with links to some tutorial videos:
https://permies.com/t/164936/CAD-Permaculture-Tech-Development
I use a combination of Draftsight (Proprietary AutoCAD clone) and QGIS (Open source ArcGIS clone). QGIS is free but not very beginner friendly. However, there are many tutorials and if you get the hang of it there's a lot of free data you can pull into your maps. For example, in Texas I can get 2 foot interval contours, property lines, water sheds and satellite imagery through the
Texas Geographic Information Office. I did a a small project for a California property using data from a similar state office.