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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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PolyMC
A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)
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Minetest
Minetest is an open source voxel game-creation platform with easy modding and game creation
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
A mod to get around this attack by Microsoft: https://www.curseforge.com/minecraft/mc-mods/no-chat-reports
Just so you know, you could install the No Chat Reports mod to disable signatures in chat messages (If you're installing mods, might as well install No Telemetry too.), making it so people cannot report you. Depending on the kind of multiplayer (like, if it's just minigames or something), that might make playing multiplayer acceptable to you (understandable if it doesn't though).
Mojang made people think they had to migrate, but currently it seems the authentication servers still work if you use the old legacy Java-based launcher (or a third-party launcher that has fixed Mojang accounts, like PolyMC). But, that doesn't help people who've already migrated, and there's no way to register a new Mojang account.
One thing that may be an option in the future is moving to MineClone, a free (as in freedom) clone of Minecraft. Unfortunately it's quite unfinished and there's not a good world converter for Minecraft 1.13+ yet, but if a world converter was made you could keep the things you made and yet move away from Minecraft (link to one of the existing converters). The users of Minecraft cannot control the direction of the game, since it is proprietary software, but since MineClone is free software, the users can control it if necessary. If you want to move to MineClone (or any other clone or re-implementation), my advice would be to stop updating your world until you do.
This thing that I made might circumvent bans, not tested though
Well, I guess I am sort of repeating things I don't fully understand. I've never actually read the source code of Minecraft, because I want to be allowed to contribute to re-implementations like TrueCraft, for example (even though currently, I don't really have the skills to do that).
What I personally enjoy is, there is no company behind. It's made by the people for the people. Also because, let's be real, if Minecraft is still this famous, it's because of server staff and content creators - builders, coders, streamers etc., not because of what it happens upstream. Minetest code is public (meaning everyone can improve Minetest itself) and also anyone can upload their content for the community on ContentDB (which is basically a store where everything is free). Sometimes I like to imagine what could happen if all these people moved from Minecraft to Minetest