Airgora - A visual community for physical product designers
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
VSCO Messages - A place for creative conversation
Galette - Galette is a membership management web application towards non profit organizations.
Archive.md - archive.is allows you to create a copy of a webpage that will always be up even if the original link is down
Bigtent - BigTent is a web-based organization and communication portal for groups.