Makatopia

Weight Shaper is a Blender addon for streamlining weight painting. Pose a character, move vertices to refine the deformation, then run Optimize Weights and the addon automatically generates the weight paint to support your adjustments.

Weights and Bones is a Blender addon for weight painting and rigging. Its main feature is fast weight-paint mirroring that works even when the mesh isn't perfectly symmetrical, alongside bone parenting and brush tools.

Figure Blockout Generator (FBG) is a Blender add-on that builds proportioned human blockout figures directly in your scene. Shape proportions, pose the figure, use the meshes as a modeling base, or bake to a standard armature.