So quake live is pretty fun

PunkBuster EULA: 

Licensee acknowledges that PunkBuster software is optional and is not a requirement in any respect for using or enjoying games that integrate PunkBuster software technology. Licensee also acknowledges and agrees that PunkBuster software is self-updating, which means that future updates will, from time to time and without any notice, automatically be downloaded and installed as a normal and expected function of PunkBuster software. Licensee further acknowledges and accepts that PunkBuster software may be considered invasive. Licensee understands that PunkBuster software inspects and reports information about the computer on which it is installed to other connected computers and Licensee agrees to allow PunkBuster software to inspect and report such information about the computer on which Licensee installs PunkBuster software. Licensee understands and agrees that the information that may be inspected and reported by PunkBuster software includes, but is not limited to, Licensee's Internet Protocol Address, devices and any files residing on the hard-drive and in the memory of the computer on which PunkBuster software is installed. Licensee acknowledges and agrees that if Licensee does not want Licensor to collect and process such information, Licensee should not use the PunkBuster software. Further, Licensee consents to allow PunkBuster software to transfer actual screenshots taken of Licensee's computer during the operation of PunkBuster software for possible publication. Licensee understands that the purpose and goal of PunkBuster is to ensure a cheat-free environment for all participants in online games. Licensee agrees that the invasive nature of PunkBuster software is necessary to meet this purpose and goal. Licensee agrees that any harm or lack of privacy resulting from the installation and use of PunkBuster software is not as valuable to Licensee as the potential ability to play interactive online games with the benefits afforded by using PunkBuster software.