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TweetyProject is a collection of Java libraries that implement approaches to different areas of artificial intelligence.


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TweetyProject is a collection of various Java libraries that implement approaches to different areas of artificial intelligence. In particular, it provides a general interface layer for doing research and working with different knowledge representation formalisms such as classical logics, conditional logics, probabilistic logics, and argumentation. Furthermore, TweetyProject contains libraries for dealing with agents, multi-agent systems, and dialog systems for agents, as well as belief revision, preference reasoning, preference aggregation, and action languages. A series of utility libraries that deal with e.g. mathematical optimization complement the collection.

TweetyProject is in development since 2010.

Project website:


Step-by-step guides can be found here:


Want to contribute? We appreciate it! If you find a bug or would like to request a feature, please open an issue here. For bug reports, include steps to recreate the bug and screenshots, if possible.

If you want to make your own contributions to the code, follow the usual steps:

  • Fork this repository
  • Create a new branch git checkout -b wip/myfeature
  • Make your changes
  • Add your changes git add your-files
  • Commit your changes git commit -m "description of your feature"
  • Push to your branch git push origin wip/myfeature
  • Create a pull request`


A manual on how to use TweetyProject in your programs is currently in development.


All parts of the TweetyProject available on this website are licensed under the GNU Lesser General Public License version 3 (beginning with TweetyProject version 1.6, the versions before are licensed under the GNU General Public License version 3) except when this is noted otherwise. Use and modification of the libraries is encouraged but please give credit by referring to this repository. Please note that some libraries make also use of other third-party libraries such as Apache Commons.