Doomed animation (Inverse kinematics)

I've been searching for a couple days now and it seems that there's just no efficient way to animate non-humanoid models. Well let me be more specific, The only real solution I've found is using the Final IK plugin but I just simply don't have 90 bucks right now. I wanna know if anybody knows a more efficient way before I attempt trying to script custom Ik's myself.