Source RCON Console is a basic implementation of the Source RCON protocol. This project is presented as an ajax console, but the core is a small standalone PHP Class that can be used to send individual commands from other sources.
The class implements only Source RCON protocol, it will not work with CS 1.6 and the like. However it does work with Source RCON-compatible games such as Minecraft and I made a small color parser for minecraft strings.