These Blender 3d add-ons are mainly designed for rapid environmental hard surface modeling for concept art and character modelling but can be used for many other situations as well such as creating movie or game assets and can also serve as an all around modelling support tool.
Download file has pdf quick guides for each of the add-ons. Contacts and links are also included in the miscellaneous section of the pdf files.
* Dyntopo Plus is still being ported to 2.8.
*All updates are free.