1. Zulip (Slack clone with proper threading)
2. after evaluating Kanboard and WeKan we decided to keep it simple and reuse the Gitlab (issue-tracker) as a Kanban board (we already used gitlab anyway so this was something everyone was familiar with).
2. after evaluating Kanboard and WeKan we decided to keep it simple and reuse the Gitlab (issue-tracker) as a Kanban board (we already used gitlab anyway so this was something everyone was familiar with).
[1] https://github.com/zulip/zulip/commit/ea43d2e40e59cb0240ea36...
Before Zulip we used XMPP for a long time but found clients to be a bit lacking. We moved to Mattermost for a brief period until we stumbled on Zulip and thought; Dang, they got the threading thing right... So we switched to Zulip and it has been great for us.
The organisation uses Kanboard for all kinds of projects. IT development uses Phabricator. As a gapps / exchange replacement we use Open-Xchange. Actually we have been using that since it was open sourced almost 13 years ago.