Linux User Groups, often called LUGs, are gatherings of Linux users. Organization can range anywhere from very loose to highly motivated. Think of it as a combination of technical support and social outing, both at once.
BLT GNU/Linux Users' Group
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Global 'virtual' LUG. Has a mailing list and IRC sessions for members all around the world, and holds activities this way.
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Linux Forensics
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User group dedicated to using linux to forensically examine computers. Open to all, topics be related to forensics and log exams.