Half-Life and Quake related projects:

• Half-Life Featureful - my improvements and additions to Half-Life SDK. A lot of Opposing Force, SoHL and Sven Co-op features implemented. Can be used as a base for a Half-Life modification.
• def2fgd - convert GtkRadiant .def and Netradiant .ent files to JACK .fgd.
• Qt image plugin for Half-Life .spr - plugin for Qt and KDE to load Half-Life sprites as images. Allows easy viewing of Half-Life sprites in Gwenview.
• Quake and Half-Life MIME types - MIME types descriptions for resource files of Half-Life and Quake games series. Useful in freedesktop environments.
• Game watcher - query server information for various games (Quake, GoldSource and Source games), with simple web interface.
• hlbmpwatcher - watch new screenshots in Half-Life and automatically convert them to PNG.

Freedesktop specifications implementations in D programming language:

• Desktop base directories - base directories in the file system.
• Desktop entries - parsing and launching .desktop files.
• Icon themes - parsing icon themes and finding icons locations.
• Shared MIME database - parsing MIME database.
• Trashcan - putting files to trashcan and listing trashcan contents. Also available for Windows.
• MIME Applications specification - associations between applications and MIME types.

Other useful libraries written in D programming language:

• Findexecutable - finding executables in system paths.
• Mofile - parsing GNU gettext .mo files in D with permissive license.
• Openfile - use symbolic constants instead of C-style strings to open files.
• Resusage - evaluating RAM and CPU usage by process or the whole system.
• Standardpaths - getting standard locations in the file system.
• Volumeinfo - listing currently mounted partitions.