The default Minecraft loop with other people in it — gather, build, and keep what you make. Covers everything from plugin-heavy worlds with claims and an economy to whitelisted, close-to-vanilla SMPs; filter by feature to tell them apart.
CraftRise runs Creative, Minigames and 2 other gamemodes on Java, accepting Minecraft 1.8 to 1.21. Listed from a public status ping; its owner has not claimed it yet.