Hi Hydrolexo…
I can feel the pain you are suffering…! 
and Really wish if there is a plugin for Blender for texture baking.
I had never tried Blender, and don’t know if you can export your work from Blender to 3ds Max OR Maya, just for unwrapping and import them back to Blender…!!
My suggestion is to try one of the following:
_ Flatiron for 3ds max
_ Unwrella for both 3ds max & Maya.
http://www.unwrella.com/download/
Since I had tried Flatiron I encourage you (in case you know how to use Max) to try the Trial version for 3ds Max, it was very helpful for me 
http://www.texturebaking.com/download-order/
Best Regards