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Crabgrass is a software libre web application designed for social networking, group collaboration and network organizing, with the goal of creating communication tools that are tailored specifically to meet the needs of bottom up grassroots organizing.
Crabgrass is released under the GNU AGPL licence and it's built with Ruby On Rails.
RiseUp.net instance:
https://we.riseup.net/
Docs
https://we.riseup.net/crabgrass/user-documentation-index-v0-0
Code:
git clone git://labs.riseup.net/crabgrass.git https://social.coop/media/gh2UVECXzByRrLFQPwE