Hamster Font Manager (HFM) helps you control the avaliability of fonts in all of the supported applications from a central place. It includes modules to support X11, Ghostscript, and TeX. A PostScript module handles PS Fonts while other fonts remain untouched by this program. It features a nice Tcl/TK GUI. For X11 configuration to work, this software has to run on the machine's own X Server.
HaruspeX is a visual environment for image databases. You are able to store and perform queries by image content (given an image, retrieve all the one similar to the given one) in a PostgreSQL database. You can use HaruspeX either as a standalone X11/GTK application or as a GIMP extension, in interactive, batch or WWW mode.
Harvest-NG is a set of tools for building a standards-compliant Web crawler. It is implemented in Perl, and can provide a complete resource discovery system, along with a modular structure which allows others to easily customise the system to their own needs. The development of Harvest-NG was started as an attempt to preserve the strong features of the Harvest architecture, but to allow more rapid developing and prototyping from a cleaner, better structured codebase.