I really liked the freerolls that existed at pokerstars, although there are a lot less now, I still play and have a lot of fun.
I like the
partypoker freerolls, in addition to the diversity of low-limit games available, you can raise your bank by playing cheap tournaments.
I recently started playing GGpoker, there are stayhome freerolls, I liked the structure, I plan to invest more time in that room.
There are good tournaments on 888, but as the
App for smartphones I didn't like, I end up not playing much, since I usually play more on my phone than on the PC.