LibreCAD VS FreeCAD_assembly3

LibreCAD, OpenSCAD (more script based and more for solids), FreeCAD.

CAD options on Linux are more limited than windows or mac but they do exist. The industry standard for 2d CAD files is the .dxf file format. I use LibreCAD. https://librecad.org/ The UI is a little clunky and eccentric in places but it is feature complete for 2d CAD drawings.

Try https://librecad.org/

LibreCAD similar UI, only for 2D

You could also try out free AutoCAD alternatives like libreCAD (2D), or brlCAD (2D&3D, I believe)

It seems like a low risk purchase for $1, however, there are free options available too such as https://librecad.org/ . Or see https://www.reddit.com/r/humblebundles/comments/117ki1c/comment/j9v0v37/?utm_source=reddit&utm_medium=web2x&context=3 for an older Autocad clone. Beckercad 2D seems like a niche product so I would probably invest my time learning something that is more mainstream.

For 2d stuff I tend to use Libra cad https://librecad.org/

SketchUp, QCAD, LibreCAD, TinkerCAD

If the general python API isn't enough the assembly3 docs have an interesting example which might give you some ideas for moving objects along within their constraints.

I think Realthunder's branch may have midpoint constrain you're looking for (https://github.com/realthunder/FreeCAD_assembly3/issues/51).

Also if you use this fork of freecad: https://github.com/realthunder/FreeCAD_assembly3/releases its much better at letting you attach sketches to faces without it borking things.

Take a look: https://github.com/realthunder/FreeCAD_assembly3/wiki/Topological-Naming-Algorithm

FreeCAD is still in development and you may have a mismatch of versions. Try .17, .18, .19, and .20 dev versions and try to find the one that doesn't show empty sketches. It may have even been made with the RealThunder branch.

Fusion 360 is probably the best choice to start. It's free and easy to use. But there are quiet heavy limitations as autodesk changed their licenses. I recently switchend from fusion to freeCAD and I'm pretty happy with it. I highly recommend Linkstage3, a freeCAD fork by a guy called realthunder. https://github.com/realthunder/FreeCAD_assembly3/releases

If you haven't already, take a look at Realthunders Linkstage branch. That's the one I usually use, although it can lead to adapting design practices that are not ideal.

FreeCAD fork linkstage3 supports expressions for patterns which I imagine would allow you to do this.