Strigi is a desktop and indexer independent desktop search engine. Its main features include very fast crawling, a very small memory footprint, no hammering of the system, and pluggable backends (currently clucene and hyperestraier was provided). Communication between the daemon and search program is done over an abstract interface which is desktop independent. A small Perl program with an example of how to query the database is included along with an example KDE client application and a KIO interface.
SRESI is a smart bookmark manager. It currently sports both a command-line and a PHP interface. It works with both the standard hierarchical trees and the new and fashionable tagged bookmarks. It was developed as a way to interface both representation systems. SRESI can use Del.icio.us, Mozilla, Opera, and XBEL bookmarks, and handles a few more exports besides. Directories and tags are used equivalently, and the final hierarchies are inferred from actual tag use.
Autodia is a command line Perl application that generates UML class diagrams from source code, SQL, and database connections. It supports multiple programming languages including SQL, and can output images (using GraphViz/VCG/SpringGraph), Dia XML and Umbrello XML, or custom formats using templates.
PIVIAU is a PHP/MySQL Web based gallery for pictures, videos, and audio that supports tags and EXIF. Albums and pictures have searchable tag, country, city, place, date, subject, and author. An RSS feed is available for every seach you can do, or for recent pictures. There is an AJAX-powered slideshow. Pictures are resized using PHP GD image functions. Videos are viewable a la Google Video using a video flash player. Audio (WAV and MP3) is supported via the embed HTML tag. EXIF is supported via PHP exif functions to extract the picture date.