How to edit fbx animations?

Hi, I have several free mecanim animations i got from the asset store.. I was wondering if there is any application that can help me edit them.. I usually work on blender, but apparently i can't import the fbx animations in blender. So, short of going thru a big learning curve on 3dsmax or maya (Not to mention the costs..), is there any other option to edit these animations? I did try with the curve editor in Unity.. But that is not so convenient, as rotating the bones and animate by hand. Thanks Rajesh