foosel, So @StraToN is asking to establish the hashtag #LibreMonday on mondays to share #floss & #opensource projects they like with the world, and that's something I can totally get behind!
I'll start with breaking a lance for @FreeCAD.
I switched to it for all my CAD needs around three years ago now.
It took me the better part of a weekend going through some CAD challenges to wrap my head around most of the differences to what I used prior, and I haven't looked back since.