Just by checking https://lemmy.ml/communities one can see the most popular communities of lemmy.ml. The plan here is to list all the alternatives for those from other instances. One can also suggest alternatives to be added here and I update this living document.

• Anarchism --> [email protected]
• Anime --> [email protected]
• Art --> [email protected], [email protected]
• Ask Lemmy --> [email protected]
• Gaming --> [email protected], [email protected]
• General --> [email protected], [email protected]
• Green --> slrpnk.net, [email protected], [email protected]
• Cryptocurrency --> [email protected]
• Fediverse --> [email protected], [email protected], [email protected], [email protected], [email protected]
• Late Stage Capitalism, futurology etc. --> [email protected]
• Libre Culture --> [email protected]
• Linux --> [email protected]
• Memes --> [email protected], [email protected], [email protected]
• Music --> [email protected], [email protected], [email protected], [email protected], [email protected]
• Open Source --> [email protected]
• Piracy --> [email protected]
• Politics --> [email protected], [email protected], [email protected], [email protected], [email protected]
• Political Humor --> [email protected]
• Privacy --> [email protected], [email protected], [email protected], [email protected], [email protected]
• Programming language communities --> [email protected]
• Self-Hosting --> [email protected], [email protected]
• Socialism --> [email protected], [email protected]
• Science --> [email protected], [email protected], [email protected] [email protected]
• Technology --> [email protected], [email protected], [email protected], [email protected]
• Videos --> [email protected], [email protected], [email protected]
• World News --> [email protected]
• Misc --> [email protected]