USENIX Association | 4,063 followers on LinkedIn. The Advanced Computing Systems Association. Champion of #openaccess. | USENIX is the Advanced Computing Systems Association. For over 40 years, it has been the leading community for engineers, system administrators, scientists, and technicians working on the cutting edge of the computing world. USENIX conferences are the essential meeting grounds for the presentation and discussion of technical advances in all aspects of computing systems.