Fingers IK | Fingers IKs are now part of Auto-Rig Pro! Backward compatible with older rigs, IK-FK switch and snap, IK control from root or phalange tip, and a bunch... | By
Hand Rig | Avalab
Blender Drivers for Hand Rig - BlenderNation
Cartoon Hand Rig - Free Download - BlenderNation
ArtStation - Rigging Hand in Blender
Blender Rigging and Animation - Character & Animation - Epic Developer Community Forums