After reading the License, please proceed to Download Ontop

IMPORTANT: By downloading the software you agree with the licensing terms.



The Ontop framework an open source project available under the terms of the Apache 2.0 License.


All non-source code documentation is licensed under the Creative Commons (attribute) license.

Contributing to the project

Contributions to the project are welcome and encouraged. The contributor should sign a Contribution License Agreement (CLA) that allows FUB and the ontop team to redistribute their work under the terms of the Apache 2.0 license. If the contributor works for an institution that owns the work being contributed by the contributor, then a corporate CLA must be additionally signed. The CLAs are available for download bellow, once signed please FAX or email a scanned copy of them to the given number/email address:

If you have any questions, please contact the ontop team.