I've been learning FreeCAD, while it's still more frustrating than Fusion or SolidWorks it's much better than it used to be pre-1.1, and it's FOSS. Also constraint-based, I've been using the new spreadsheet view as the source of all constraint dimensions, with parts derived by binding to top, front, or right-side orthographic "master" sketches. Much like hand-drawn design, where you draw the orthographic views and use those directly to create an isometric view.