Here’s one that most of you have probably not heard of. Monster Hunter Frontier.
MHF was a Monster Hunter MMO that ran from 2007 to 2019 and was exclusive to Asia. Recently, a dedicated team of community members have managed to revive it with community servers.
It is brutally difficult, only partially translated, and has some genuinely awful controls, BUT
It’s only around 6GB and completely free.
If for some reason you want to try it I highly recommend joining the rain server, as it is the most populated and stable one. They also have a setup guide for how to install on their discord server I recommend you use.