-Cracks knuckles-
Comicfury - A webcomic site from the early internet days! If you want your own hosting, but can't afford it, this is the best alternative you can go to. It allowed total site customization so your comic landing page can fit your work, also there are no restrictions regarding mature content (Outside of hate speech and such.), even the raunchiest porn is fully allowed. They also allow ad space so you can make some money off your work from ads, and they have a forum so you can interact with the community.
FlowFo - A site that originally specialized in art, but has been taken over by webcomics. It doesn't have customization, and the mature rating is limited to R/M, but it's pretty easy to use once you get into it. The owners also like to promote creator's works from time to time. If I remember right you can also set your stuff behind a paywall.
Global Comix - This webcomic site is similar to FlowFo, but it's exclusively for comics, and if I remember right it's US based. They also set up a thing were you can add your crowdfunding campaign to the site so people can see it and your goal progress, as well as go pledge.
The Duck Webcomics - Formally known as Drunk Duck, another webcomic dinosaur from the old internet days. Like Comicfury this one also allowed adult content, and has means of community interaction via a forum and weekly news posts. Although unlike Comicfury they don't have customization. They also have a small podcast ran by the admin and his mods, as well as a weekly comic feature. Last I checked their Twitter page also holds a weekly Q&A, but I'm not sure if they still do that.
Regarding collectives:
Spider Forest Webcomic Collective - A community based private collective, unlike Hiveworks it has no corporate features, they won't publish your books or merch for you, but it's a good place to be if you just want to be part of a supportive community with a lot of experience and resources. They also have multiple community events, including anthologies you can choose to be a part of. This collective only accepts via application during application season, depending on the year they may also provide a site for you, although it's recommended you have your own stand-alone site.
Hiveworks - From what I remember also only accepts via application, during application season. These guys are more of a business, so they'll aid in creating books and merch, and I think you also get paid but don't quote me on that.
Also as silly as it sounds, you can also set up a comic site via Tumblr. There's a template for it you can use, I've read some pretty good comics on it like Lost Honey, and it would also be another decent alternative to having a stand-alone site.
Edit: Forgot about Dillyhub. This one is definitely geared more as an art site, but there is a section for comics, which has a good selection already if you scroll down to 'Discover'. Dillyhub is pretty new still, just did their official launch not too long ago. I'm not sure how it is for the official launch, but during the beta they allowed mature content for their comic section, but not the art section as it would be featured on their app. (Similar situation as Tapas and their mature comics only being allowed on the desktop site.) My comic is still up there so I assume mature stuff is still allowed.
