The eXtensible Text Framework (XTF) is a powerful open source platform for providing access to digital content. Developed and maintained by the California Digital Library (CDL), XTF functions as the primary access technology for the CDL's digital collections and other digital projects worldwide.
Sphinx is a full-text search engine, distributed under GPL version 2. Commercial license is also available for embedded use.
Generally, it's a standalone search engine, meant to provide fast, size-efficient and relevant fulltext search functions to other applications. Sphinx was specially designed to integrate well with SQL databases and scripting languages. Currently built-in data sources support fetching data either via direct connection to MySQL or PostgreSQL, or using XML pipe mechanism (a pipe to indexer in special XML-based format which Sphinx recognizes).
As for the name, Sphinx is an acronym which is officially decoded as SQL Phrase Index. Yes, I know about CMU's Sphinx project.
RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX/BibTeX documents. It allows users to share databases over a network. It is accessible through command-line tools, through a web interface, from text editors (Emacs, Vim), and it contains a SRU server. Programmers can use Perl and PHP libraries to integrate RefDB functionality into their own projects. RefDB is released under the GNU General Public License and runs on Linux, the *BSDs, OS X, Solaris, and Windows/Cygwin.
The OpenLaszlo platform allows developers to create applications with the rich user interface capabilities of desktop client software and the instantaneous no-download Web deployment of HTML.
Project Open ESB implements an Enterprise Service Bus (ESB) runtime using Java Business Integration as the foundation. This allows easy integration of web services to create loosely coupled enterprise class composite applications.