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spinics.net is mostly mailing list archives these days

stack overflow | the world’s largest online community for developers

github is where people build software. more than 100 million people use github to discover, fork, and contribute to over 420 million projects.

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reddit is a network of communities where people can dive into their interests, hobbies and passions. there's a community for whatever you're interested in on reddit.

q&a for ubuntu users and developers