Development
I'm dedicating this page to development of HL programs and apps.
Jackhammer
A new approach into map editing and level creation crosses your path, directly from the hands of an skilled Russian programmer comes the Jackhammer map editor! Enriched with nice features and handy tools that every old school, and new school, mapper would be glad to give a try. Its aim is achieving a program that is an convenient cross-platform tool capable of incorporating the best features of existing editors, such as Valve Hammer Editor, Q3Radiant and others. Make sure to give it a try!
Xash3D and XashXT
Are the next generation Gold Source Engine upgrades and engine modifications. Xash3D increases the original limit by a whole lot! Really amazing stuff to check out. Very good for single player mods due to the entire engine functioning just like GS but adding a metric ton of new possibilities. This engine is compatible with almost all Gold Source games, so you can easily map and mod for that mod using the FGD-s.
http://www.moddb.com/engines/xash3d-engine/downloads
http://hlfx.ru/forum/forumdisplay.php?s=&forumid=1
VHLT Development
If you wish to know more about VHLT (Vulzacn Half Life tools) development, please visit this page located on Sven COOP forums:
http://forums.svencoop.com/forumdisplay.php/217-Vluzacn-s-Map-Compile-Tools
The Twister
A pretty mighty and an really awesome tool for terrain creation. The Twister is a tool that you must have! It can make complex curves, displacements, etc. Its made to give best performance and can output MAP files. It is being developed by Penguin boy from TWHL. Catch all about it here:
http://www.users.on.net/~imperialcarp/Twister/Twister.html
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SHLT Development (No longer under development)
If you wish to know more about SHLT (Super Half Life tools) development, please visit this page located on Sven COOP forums:
http://www.svencoop.com/forums/showthread.php?t=36733
Muzzes (aka The Mighty Atom) compiler (Never updates website)
TMA is making a new custom compiler that is designed for new users. Its main focus is easing the compilation and usage of the tool. Catch the latest updates on his web site:
http://www.themightyatom.nl/thecompilator.html
As ive heard, he cut development on v2 and is currently working on a more advanced v3 v4! compilator.