Sculpt Toolkit, originally called Flow Tools, is a Blender add-on written in Python by Jeacom that groups several mesh-processing tools for sculptors. Almost every feature is linked through the ALT + W shortcut.
The Optimized Remesh rebuilds a model out of quads and can add multiresolution while preserving details. Basemesh generation works through an envelope builder: Add Envelope Armature creates a humanoid model with an editable armature, Add Envelope Bone creates a single bone for building a base from scratch, and Convert Armature To Mesh turns the armatures into editable meshes. Boolean operations cover Union, Difference and Intersection, alongside a Slash Boolean for cutting extracted pieces and digging holes in solid meshes. Manipulation tools include Mask Deform, which deforms a model with the sculpt mask, and Mask Split, which separates masked from unmasked parts of the mesh.
A viewport light controls panel personalizes the solid display and can save and load light presets, plus a Random Colors button that randomizes colors per object. The add-on is released under the GPL license and supports Blender 2.79 through 2.9.