What is Tossca?

Tossca is short for "Trusted Open Source Software Contribution Association e.V.". Tossca eases the cooperation of companies in the field of Open Source Software. We do so by helping developers and companies develop their Open source Software in a legally safe way. Tossca is an initiative of companies using software as well as software development and consulting companies.

Our Principles


We are enthusiastic supporters of  using Open Source Software.
Open software is as important to us as open communication and collaboration.

Legal Security

We want to achieve legal security in the field of Open Source as far as possible. For us that means reliability, trust and consistency.

Collaboration & Cooperation

We want to foster collaboration of developers and companies in the field of OSS.

Joining as a Member

We always welcome new members. Individuals can shape the work of the association by actively working with one of our working groups. Just download our membership application form. We invite companies who want to support the association and its goals to join as a sponsoring member. To do so, please contact our board.


  • Tobias Haustein
  • Stefan Tilkov
  • Markus Kemmann
  • Frank Probst
  • Dr. Till Jaeger
  • Wim Bollen
  • Matthias Bischof
  • Oliver Wolf
  • Stefan Bodewig
  • Jerry Preissler
  • André Neubauer
  • Dr. André Wittenburg