YouSeer is an open source search engine framework, which was built on top of other open source components. It’s part of the general SeerSuite framework. YouSeer utilizes Hereitrix as a crawler and solr as an indexing system.
MuSE-CIR is a Multigram-based Search Engine and Collaborative Information Retrieval system. Written in Java /JSP, supports any JDBC connectable database - thoroughly tested only with OracleXE, and somewhat with MySQL, JSP on Apache Tomcat 5.5