anvaka.github.io
Interactive network map that shows how Reddit communities relate to each other by shared users.
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yasiv.com
An early attempt to visualize how subreddits relate to each other. The page states that it has moved and directs visitors to a newer Map of reddit for the most recent version.
tagmap.io
Tagmap creates interactive maps of internet communities such as Reddit and Discord to help users meet similar people. It matches users who share servers, subreddits and interests, and offers search by similarity or proximity, user messaging and notifications, and privacy controls. Users can set their own location and choose who can see their profile. New maps can be created and are free.