I consider Solve Space to be a very successful 3D design program. I've been dealing with it since April 2021. It doesn't produce hundreds of megabytes of work data, like other breathing programs. It is fast and not demanding on computer HW. I also see a great advantage in being able to download its source code. The creators invented it really well. (But in version 3 I don't miss anything yet). As we Czechs say: It is done with love and hours do not count. Go guys! I'm a fan of the creators of Solve Space!