Atari 8bit
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Atari 8
Atari 8bit Software/Firmware, esp. for U1MB, SIDE2, etc.
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atari8bit.net
Atari 8bit Hardware Projects (Joystick-Adapter, S-Drive Max)
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AtariAge
The "one and only" Atari community site & forum. Focus on 8bit and Gaming, but also for some other systems
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ATARI Bit Byter User Club e.V.
Germanys oldes (and best) Atari 8bit club with active forum
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AtariBits
Atari 8bit Hardware Projects, e.g. 1088XEL
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BitsOfThePast
Atari 8bit Hardware Projects
Games&Arcade
Retro Computing
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Eric S. Klein‘s Vintage Computers
US collector - very good overview, many systems
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Pixelnostalgie
German Blog about "Gaming"
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RETURN Magazine
German magazine zum about Retro-Gaming
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Verein zum Erhalt klassischer Computer e.V.
German club, dealing with various retro computing topics. Extremely competent forum.
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Vintage Computer Federation (engl)
US federation for retro computing