Apple Macintosh
Bux-Mont Macintosh Users, Erie Apple Crunchers User Group, John Hopkins Medical Institute Mac Users Group, Keystone MacCentral, MacPower User Group, Macs at Philadelphia Area Computer Society, Main Line Macintoch User Group, Pennsylvania Apple Microcumputer Users' Group, Philadelphia Power Book User Group
Linux
Bucks County Linux Users Group, Harrisburg Unix Users Group, LVLUG Home Page, PLUG, PSU Linux Users Group
Computer Users of Erie
Focusing primarily on the PC, Mac and Linux platforms with a wide range of members. Meeting, newsletter and library details.
Delaware Valley Computer Users Group
Calendar, seminars, membership and contact details.
Lancaster Microcomputer Users Group
Meetings, membership, photos, events, newsletter and contact details.
Philadelphia Area Computer Society
Providing education and communication among computer users in the Greater Philadelphia area. Newsletter, meetings, links and contact information.
Philadelphia Area Java User's Group
Includes meeting history, directions, contact information, and resource collection.
Philadelphia Area PDA Users Group
Meetings, product reviews, links and contact.
Tri-State Delphi Association
User group for the Delphi programming language serving Western Pennsylvania, Eastern Ohio and West Virginia.