SpeedSculpt allows you to create very fast characters, to manage Dyntopo Sculpting with booleans, cut curves, skin modifier, decimate etc.
when you sculpt in Dyntopo you have to go into Edit mode or Object mode to perform some operations.
This addon allows you to make those operations directly in your current mode.
You can edit your detail size and make a Detail Flood Fill with a Smooth modifier to smooth your mesh.
You can create surfaces and combine them with your current sculpt.
This addon gives you a lot of tools to do everything you need to create and sculpt your model.
You can see the examples right there ;)