Cracked Minecraft servers are also known as offline Minecraft servers. Some of the servers allow players to join without having Minecraft.net account while others combine offline and premium mode.
The only Launcher that works with all cracked servers and online servers that I could find is thisone https://mega.nz/file/eAl0FQIB#BwZRXblcKmXbsQwqq0_fjypFpkkk0jMaXF6gHEn1d2o it even comes with preloaded server list and it currently supports all versions of Minecraft tho I’m not really sure if it’s ever going to be updated.
To join cracked minecraft server you just need to try and enter a few Minecraft usernames so that you find one that is not already taken and then you can join. As with all cracked servers you will also have to register and login using ingame commands which is one of downsides of not owing Minecraft.net account.