[evanwalsh]

You can see the client code in `www`: https://github.com/solcloud/Counter-Strike/tree/master/www

The client is a lot of JavaScript (with graphics via Three.js)

[solcloud]

yes, client code is JavaScript using Three.js (https://threejs.org/) library, but since server and client is decoupled, client code can be implemented using anything, there is also php cli interactive interface, but most users prefer javascript one which is currently only one with real gui