CMS Garden Open Web Lounge

Date of publication

Digital sovereignty and data protection were the specifications for the implementation of the virtual Open Web Lounge 2020 of CMS Garden e. V.

This post describes the selection of components that contributed to the success of the event and which we were able to help deploy.For its virtual Open Web Lounge 2020, CMS Garden e. V. challenged us to realise the implementation exclusively with open source tools and self-services. Digital sovereignty and data protection should not be disregarded.

Customer wishes

  • Realise a virtual conference exclusively with open source software.
  • All tools used should be self-hosted and operated on infrastructure located in Germany. Focus on digital sovereignty and continuous compliance with the GDPR.
  • Deploy BigBlueButton and make it scalable.
  • Integration of Cloudron, as and the collaborative protocol pad CodiMD are already running on it. Members of the CMS Garden are all registered with their account in the Cloudron LDAP.
  • Participation should be possible free of charge. Interested parties should register independently. Must-have: Interested parties should automatically be registered as users in the downstream open source tools! Nice-to-Have: Single-sign-on would be nice, but is not a showstopper.
  • monitors of the instance to be able to turn screws in time.


The implementation is carried out with Univention Corporate Server, Cloudron and BBBatScale.

A more detailed description of the project can be found on the blog of our partner Univention. Article Open Web Lounge in the Univention blog.


We have learned from the initial pain and improved our setup so that we can now also equip larger events safely and with high performance.

Useful links for the setup

Profile picture for user DeepL

DeepL is a deep learning company that develops AI systems for languages. The company, based in Cologne, Germany, was founded in 2009 as Linguee, and introduced the first internet search engine for translations. Linguee has answered over 10 billion queries from more than 1 billion users.

Profile picture for user manfred.woeller

Manfred Wöller

Manfred Wöller is a TÜV-certified data protection officer who makes data protection requirements technically feasible as part of the team. He is also a passionate vegan cook who takes care of the physical well-being at community events.