Reddit alternatives and similar tools

Based on the "Communities / Forums" category.

ArsTechnica OpenForum

- Reddit VS ArsTechnica OpenForum

IT Forum which is attached to a large news site.
/r/Linux

- Reddit VS /r/Linux

News and information about Linux.

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Spiceworks Community

- Reddit VS Spiceworks Community

General enterprise IT news and small articles.
StackExchange Network

- Reddit VS StackExchange Network

Q&A communities.
Server Fault

- Reddit VS Server Fault

StackExchange community for system and network administrators.