1. Apache. Lucene:
http://lucene.apache.org/
2. Bach, K., Althoff, K.-D.: Developing case-based reasoning applications using myCBR3. In: Agudo, B.D., Watson, I. (eds.) Case-Based Reasoning Research and Development, pp. 17–31. Springer, Heidelberg (2012)
3. Bach, K., Sauer, C., Althoff, K.D., Roth-Berghofer, T.: Knowledge modeling with the open source tool myCBR. In: Proceedings of the 10th International Conference on Knowledge Engineering and Software Engineering - Volume 1289, KESE 2014, Aachen, Germany, pp. 84–94. CEUR-WS.org (2014)
4. Baumeister, J., Reutelshoefer, J.: The connectivity of multi-modal knowledge bases. CEUR Work. Proc. 1226, 287–298 (2014)
5. Baumeister, J., Reutelshoefer, J., Puppe, F.: KnowWE: a semantic Wiki for knowledge engineering. Appl. Intell. 35(3), 323–344 (2011)