FreshSMP

FreshSMP runs at play.freshsmp.fun and it's a solid pick if you just want to jump into a survival world with other people around. Building next to strangers, trading stuff, running into people while mining, that's the whole appeal here. Grab the address, pop it into your client, and you're in. If you want donor perks or extras there's a store at store.freshsmp.fun, but the base server is free to join and play.