SDF sdf.org (shell, chat, message boards), the site has a distinction between free and paid accounts
Tilde tildeverse.org (lots of different hosts, e.g. tilde.town)
rawtext.club (mostly text chat)
hashbang.sh (chat, programming, security)
projectsegfau.lt (shell accounts, web server, also has a few tools like site frontends, e.g. simplelogin for email forwarding)
chaotic.ninja (hosted services, bouncer, email, pubnix)
xshellz.com shared shell account, packages that can be installed as default
vern.cc (pubnix, hosted services, matrix)