Yes Solvespace is cool (I have made its French Site :)
http://solvespacefr.weebly.com/
But free DesignSparks is more ergonomic :)
What do you want more simple for constraint something ?
As soon as you can see a "Star" you can edit if you are in compatible constraint!
In 3D the same!
![](http://moiscript.weebly.com/uploads/3/9/3/8/3938813/6575975_orig.gif)
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