New on the radar recently is Read.cash, which is basically Publish0x that works with Bitcoin Cash.
Other great contenders that are already very establish include Steem, which currently has a long waiting list for publishers, which either means it's very popular, they are experiencing a lot of spammy accounts, or their system just can't handle it at the moment. Or something else entirely, these scenarios are all pure conjecture.
Medium is also becoming bigger by the week but has some catching up to do with Steem, Medium also has quite a strict paywall. If you sign up I believe you can only read 5 articles for free before they ask you to pay for a subscription. Signing out of Medium seems to get round this though!