The Internet Communications Engine (Ice) is a modern object-oriented data-contract middleware with support for C++, C#, Java, Python, Ruby, PHP, and Visual Basic ... it's kind of like WCF, except with a lot broader support.
« 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, [...] »