There are several suggested addons outside the Makehuman family of content, that are
suggested for creation of Custom content and continued usage of MH content past the realm
of sole character creation. There are several suggestions below with a brief explaination:

MakeClothes2

The current tool to create clothes, hair or bodyparts for hm08 and fantasy basemesh.

MakeTarget2

The current tool to create morphs for hm08, mh2bot and fantasy basemesh.

Cubemap

This is essential for creating true cube maps for skyboxes in MH 2.

UV Squares

This is truly very helpful for creating good uv maps for clothing and assets.