Solr Client Libraries / Bindings
Ruby - SolRuby
PHP - SolPHP
Java - SolJava
Python - SolPython
JSON - SolJSON
.Net - solrnet
- C#
- Perl
JavaScript
AJAX Solr, a framework-agnostic JavaScript library for creating Solr user interfaces.
Integrating Solr With Other Applications
Plone Integration: collective.solr
Forrest/Cocoon - SolrForrest
ColdFusion (Note: ColdFusion 9 now includes Apache Solr)
Drupal - A Drupal module that integrates Apache Solr in Drupal.
Various Library Catalog Applications - Solr4Lib