DirList is a user directory system that runs as a CGI to serve up user lists, search for various user attributes, view their web sites, define personalised user attributes, and keep it all synchronized automatically with the underlying operating system's user database on periodic intervals with cron.
Net::Z3950::SimpleServer is a Perl module which implements the server side of the Z39.50 (information retrieval) protocol. It hides the complexity of network exchanges, packet serialization, and session handling. You are required only to implement simple callbacks to support searching and record retrieval. It is the basis of the "Zoogle" project, which is a Z39.50 gateway to the Google web index.
Redland is a set of C libraries providing a high-level API for the Resource Description Framework (RDF), allowing it to be stored, parsed, serialized, queried, and manipulated. It has an object-based, modular design and comes with detailed reference documentation and examples. Redland supports all RDF vocabularies such as FOAF, RSS 1.0, Dublin Core, DOAP, and OWL, the query languages SPARQL and RDQL, and all RDF syntaxes including Turtle, RDF/XML, RDF/JSON, RSS, Atom, RDFa, and GRDDL.
XSet is a performance oriented main memory XML database and query engine. XSet is meant to be a low level application component that enables applications to have high speed access to stored metadata in the form of XML documents. In order to achieve the highest possible performance, XSet does not support the notion of transactions. Compared to its industry and research counterparts, XSet is miniscule. It uses a simple subset query model which is surprisingly complete for its current set of target applications. Examples of XSet applications include metadata file systems, searchable email clients, user preference registries, service discovery services, and online customized content portals. Performance evaluations have shown XSet to scale logarithmically to dataset size, and can handle hundreds of request per second on off the shelf desktop machines.
XMLDB uses an RDBMS to persist arbitrary XML documents. Due to its storage mechanism, searching for and recalling documents is extremely quick. You can also perform XSL translation on documents with surprising speed. The library can be used in any program to store libxml2 documents. A PHP module is also included, making XMLDB into a complete three-tier Web application development suite.
HyperSQL is like the doxygen program with Javadoc added, but for SQL. It hypermaps SQL views, packages, procedures, and functions to HTML source code listings, and it shows all the code locations where these are used. You can use JavaDoc-style comments for documentation and even embed UnitTests with them.
The Data Mine is a search engine designed to make a more useful interface available to users. It is designed around human-computer intelligent interaction considerations. It divides the screen into two halves. One lets you find all the instances of your query's keywords, and the other lets you look through a highlighted version of the results you choose.