Association for Computing Machinery is a major force in advancing the skills of information technology professionals and students worldwide. 78,000 members and the public turn to ACM for the industry's leading Portal to Computing Literature, authoritative publications and pioneering conferences, providing leadership for the 21st century.

The group was formed out of interested parties from two previously-existing Linux organizations, the Farmingdale Linux and Associated Technologies Club and the Brookhaven National Laboratory Local Linux Users Group . Each of these two organizations are distinct and separate from LILUG.

A local group which discusses PHP, a popular server side scripting language often used in conjunction with Linux, Apache, and MySQL.

KDE is a powerful Free Software graphical desktop environment for Linux and Unix workstations. It combines ease of use, contemporary functionality, and outstanding graphical design with the technological superiority of the Unix operating system.

The Stony Brook Computing Society (SBCS) is a an official Student Chapter of the ACM, the worldwide educational and scientific computing society. Stony Brook is well known for its high-caliber Computer Science department, and the students that take a personal interest in the field are those who are members of the Stony Brook Computing Society.