CenterStorm Online
- Project maintaining several improvisation rounds. Information on participation, archive and forum.
- http://www.centerstorm.net

Improcomics.org
- An online community of amateur webcomic artists participating in impromanga projects. Genres include action, comedy, and romance. Also includes member pages, greeting cards, and forum.
- http://improcomics.org/mainpage-flash.html

Biseinen.com
- Dedicated to the ever popular "Beautiful man" in Manga, it features shoujo, shounen-ai/yaoi and fan works.
- http://www.biseinen.com/

MK Impromanga
- Currently featuring the impromanga Power Force with more planned in the future.
- http://www.neggie.com/comics/imanga.html