« Solr is the popular, blazing fast open source enterprise search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing distributed search and index replication, [...] »
JGate provides free AppJet hosting. AppJet is a proven technology stack that includes Rhino, Cloudscape/Derby, Jetty, Lucene, Comet, Processing, JQuery, XMLRPC and JSON. Programmers use it to produce server-powered, highly interactive web applications in a fraction of the time normally needed.