What i understand from rotatable bonds is they can turn around like 360 degree and unrotatable bonds are the rigid ones. But as you know that there are bonds vibrating or moving to some extend but not 360 degree.

1- How can i see which bond has moving capacity to which extend?

2- How can i give that ability to the bonds?

I can see that there might be a way on Autodock: Edit - Set Torsion Angle. But i couldnt figure it out. Could you please help me.

And also if there is another (preferably-free) programs for that you can recommend.

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