1. SWCPoker.eu - Free tournament every hour with 1000 satoshi reward. Quarantine special free tournament twice a day with 20,000 satoshis each. And other free tournaments for high Krill users.
the quarantine series (including the twice daily 2k chip freerolls) are ending tomorrow. only 4 more quarantine freerolls left.
most open freerolls aren't worth the time---big field, tiny prizes. private freerolls may be worth looking into though. for example, on ACR Poker, if you open up the tourney > private tab, there are several private freerolls for $100 or $250. you need to join the poker community in question (eg thenuts.com) to get the passwords.