Yes, Norikra uses Esper. That is great software. Norikra provides: 1. schema-less processing: Esper requires schema for all events and queries, but Norikra qu

Yes, Norikra uses Esper. That is great software. Norikra provides: 1. schema-less processing: Esper requires schema for all events and queries, but Norikra query does not requires any schema 2. nested hash/array access by extended SQL(EPL) 3. standalone server software: applications in any languages can use stream processing over RPC 4. lightening deployment: only 3 minutes by jruby+gem install And UDF over rubygems, connecting query output into other query inputs, and much more.