MRML for KDE is a KDE MRML client which offers integration of content-based queries into Konqueror/KDE. It consists of a KPart (which could be embedded into Konqueror for example) and a kio-slave for communication with the MRML server. You can right-click on an image and choose "Search for similar images..." in the context-menu, which will perform a query on a server and present you a thumbnail view of the results. You can also refine queries by giving relevance feedback.
lookuplet is a GNOME utility that allows you to easily enter search terms (it automatically grabs the X selection when invoked) and then press a key combination which will cause those terms to be substituted into a URL which is launched using your preferred Web browser, or to be substituted into a command line which is invoked. It is rather useful for things like dictionary lookups, Web searches, map lookups, etc. The idea is to shave seconds off of queries that you find yourself doing all of the time. Though it uses the GNOME libraries, it doesn't require that you be running the GNOME desktop environment.
Alexandria is a GNOME application to help manage a book collection. It retrieves book information (including cover pictures) from several online libraries, allows you to search for a book (either by EAN/ISBN, title, authors, or keyword), can import and export data into ONIX, Tellico, and EAN/ISBN-list formats, generates Web pages from your libraries, allows marking your books as loaned, saves data using the YAML format, features an HIG-compliant user interface, shows books in different views that can be filtered or sorted, and handles book rating and notes.
Surftree is an applet that displays data organized in a spreadsheet as an expandable tree on a Web page. The tree can be 9 levels deep and have over 65,000 nodes. Each node can display up to 4 independent Web pages or JPG images. It works with Java 1.0 and 1.1+ and in any Web server environment.
SkaLinks Exchange Script is modern and convenient script for arranging link categories on those sites that employ the reciprocal links exchange concept. It features link exchanging, category hierarchy support, virtual category support, related category support, an admin panel, customizable settings, statistics display, broken links verification support, a fast-to-customize layout interface, an advertisement system, multi-criterion search, a script installer, a directory editors system, and an advanced system of most popular related searches.
Pinot is a D-Bus service that crawls, indexes your documents, and monitors them for changes. It is also a GTK-based user interface that enables you to query the index built by the service or your favorite Web engine, and display and analyze the results. It makes full use of advanced indexing and search facilities offered by Xapian, features language detection, dynamic document summaries, easy labelling of documents, and internal support for common file types. The D-Bus interface allows easy integration with other applications.