Dessy is a DEsktop Search and SYnchronization framework for mobile devices. It allows file search using content, metadata, and custom tags, and synchronization of results, and entire file system subtrees. It works on MIDP 2.0 handsets and Java 2 SE.
TiTLi: A Google-like, full-text search tool for relational databases. It is very fast and independent of vendor specific RDBMS's like mysql, oracle etc. It uses Apache Lucene for indexing and provides some advanced features like similarity search.