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RefDB is a reference database and bibliography tool for SGML, XML, and LaTeX documents, sort of a Reference Manager or BibTeX for markup languages. It is portable and known to run on Linux, Free/NetBSD, OSX, Solaris, and Windows/Cygwin.
QDepo - formerly known as TPDA - Query Repository Tool
...The graphical user interface is based on wxPerl or PerlTk.
The main feature of the application is the SQL query repository management. The repository consists from a collection of XML files that ca easily be moved or copied to other computers.
The supported formats are Excel (.xls), ODF and CSV. The Database management system support includes CUBRID (new), Firebird, MySQL, PostgreSQL and SQLite.
Redland is a set of object-based, modular and portable C RDF libraries providing RDF APIs for the graph, triple storage (librdf), RDF/XML parsing and serializing (Raptor), SPARQL RDF querying (Rasqal). Language APIs in Perl, PHP, Python, Ruby and others.
osPortal in an Open Source CMS/Portal system built with PHP5 and mySQL. osPortal is a template driven OOP application. The core consists of 5 modules: Membership, News, Forums, Template Engine and The application Framework.