Should I buy Spriter or there's any good free alternative?

Should I buy Spriter or there's any free alternative that can provide a decent level of performances?

You might want to check out DragonBones.

http://dragonbones.com/en/index.html

Both programs are great and very similar. Spriter is reasonably priced, has detailed documentation, and has lots of tutorials to get started right away.

DragonBones is free and has mesh deformation (Spriter doesn't). But the documentation is poor and not a lot of tutorials.

However, István Szép has a DragonBones course on Udemy that is very comprehensive.

(Nima) is free and there's a plugin for C2 that works with it.