JVL and Josh run the http://webhosting.coop/
as well, and understand many of the pitfalls of the old models of software. Combined we have decades of experience working with software development teams, both as developers and leaders. We have a Gitlab instance setup for code collaboration:https://gitlab.webhosting.coop/
and a corresponding mattermost instance for real time collaboration via chat:https://mattermost.webhosting.coop/
Mattermost is a self hosted clone of slack which has the added benefit that we aren't prone to the limitations seen with slack (we can have as many users and integrations as desired). Recently, we took this setup to the ATXhack4change at St. Edwards University: http://atxhackforchange.org/
At ATXhack4change, we added many people to the team, some people we knew already,and more importantly, some additional talented friends, rounding out our team even further.
Resulting in: https://gitlab.webhosting.coop/groups/bokbot/group_members
We hacked away over the weekend and ended up winning the 'Most Austin Project" award!