Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
With this program you can make your own half-life maps,or edit
There is also an optional 3.5 beta update hidden around the internet that is well worth the trouble finding it and the updated .fgd's for the games you want to map for..
Here's a link to a download on cstrike-planet.com. It requires Hammer 3.4 of course installed beforehand, as it is a patch.
Cstrike-planet.com
It SHOULD work.
Why are you using a picture of Source Hammer?