TMC Links (Technical Minecraft Resources): https://gist.github.com/JoakimThorsen/e90bd7a588af25ae529530987d9acc8a
Here is a more detailled comparison: https://mc-launcher.tayou.org/
Java Edition Performance Tweaks https://exa.y2k.diy/garden/jvm-args/
My go-to launcher. Community run, FOSS, tons of features, lightweight and cross-platform!
Mojang/Microslop account owning a JAVA license is needed!
No account required on this fork: 
Freesm Launcher
A fork of PRISM with alternate auth server account (ely.by, Drasl or Blessing Skin). Can be used to play without mojang/Microslop account.
Worth mentioning:
PineconeMC (formerly ElyPrism Launcher) Ely.by auth servers
A great Java launcher for Android. Account required.
Make a new file called "circumventLimit" to Android/data/com.movtery.zalithlauncher.v2/files in order to bypass Microsoft account requirements.
A great option for both Android and iOS/iPad OS (NOT ON APPSTORE, need sideloading) Account required.
Vanilla modpack with only optimization tweaks to make the game run smoother
If minecraft was a VR title in the first place. Still in beta and active development
Has an unofficial Quest port, made by the community: https://github.com/coah80/questcraft-visor-releases
Recommanded plugin: https://spark.lucko.me/
An unofficial Minecraft Bedrock client for Windows that bring more features similar to Java launchers.
Awesome 3D modeling and animating software that has Minecraft specific features and plugins.
The FOSS clone that is still quite different
If you want an experience closer to minecraft use this mod: 
VoxeLibre (formerly MineClone2)
A survival game I just love and made me feel the same emotion I got when experimenting minecraft in my first playthroughs.
Very different game though.
