It's not too late for a post on #libremonday!
I would like to focus on [#Mattermost](http://mattermost.org/) today which we at our institute use for team collaboration and project management. It is an open source alternative to [Slack](http://slack.com/), but slim and non-distracting.
I would not say that it has become a substitute for email, but for targeted problem solving it works great.
For further reading on Slack and the like in research see e.g. https://www.nature.com/news/how-scientists-use-slack-1.21228
If you are interested in learning more about
and many other #OpenSource projects that allow you to replace Office365 then you may want to come to the Kopano Conference the 27/28 of September.
That's not just for techies but if you wish you can be trained and certifies as Kopano Engineer the 27th.
Today and tomorrow the #OER community will meet in the north of Germany to join/give sessions and workshops on various topics.
The event will be in German, please find more information on the website http://www.oercamp.de/17/nord/workshops/