Mischief-Free 2.0 Mischief Infinite Canvas
Blender GreasePencil _Edit_Strokes_Branch
http://www.graphicall.org/1140
[video=youtube_share;_xCBk3j29dI]http://youtu.be/_xCBk3j29dI[/video]
…by Thomthom for Sketchup free 
[video=youtube_share;1dQwNhpLp3w]http://youtu.be/1dQwNhpLp3w[/video]
My test on 2014 
NetFabb Basic : all for repair your model for Print 3D or other things! 
Actually 5.2.0 (for all systems)
Dynamo works as standalone or as addin.
The interesting part is there also an open source plugin for dynamo which called Rhynamo. Rhynamo enables dynamo to read also 3dm file.
Numerous tutorials and videos!
Pixilang is a pixel-oriented programming language for small graphics/sound applications and experiments.
Originally created by Alexander Zolotov (NightRadio) and Mik Razuvaev (Goglus) for non-programmers, demosceners and designers.
It is cross-platform and open source (MIT License).
merci beaucoup for all the links and free apps infos. can’t stop returning to this thread.