Why the hell is this on here? A GUI? Why should we care? Well, the GUI is released by Lars Holm "h0lm" Jespersen from CKRAS Gaming, an individual who has done so much to promote and improve CS:S and CS:GO since Valve came back to their forgotten games.
His GUI represents one of the best out there and has been constantly improved as the game has evolved. The graphical improvements and the way information is presented definitely make it worth considering for any serious competitive player. You can see for yourself with the screenshots below.

Lars had the following to say to Cadred.org about this latest release:
I've recieved a lot of great feedback from my old GUI and had around 22,000 downloads in all. v4.0 has been long under way but I think it turned out great - I hope that those of you that use GUIs will like it. Thanks to Cadred for letting people know!
Download the GUI here.
FAQ and Screenshots.