It came up in IRC and I noticed my list of webcomics here is quite outdated.
So...
ARISE THREAD
All of these can be found on Comic Rocket, which is also how I manage to keep track of them all.
Abstruse Goose A bit like xkcd. Currently on hiatus
Awkward Zombie A comic about sily things in games
Boxplot, previously
Sci-ence, a great science comic
Buttersafe
Calamities of nature Finished
Children of Eldair Fantasy
Chirault Fantasy
Clique Refresh A comic about trying to be an adult and friends you've only ever met online
Cockworks Steampunk
Commitstrip A comic about coding
Cucumber Quest Fantasy
Digger Fantasy. Finished
Everblue Fantasy
Far Out Steampunk, western
Fey Winds Fantasy
FoxTrot A comic about a not that normal family
Fragile Slice-of-life-ish?
Gaia A very good fantasy comic
Girl Genius Steampunk
Grrl Power Superheroes
Gunnerkrigg Court, on Scytale's recommendation. I'm all caught up now (Comic Rocket makes binge reading way too easy
) and it's very good indeed!
Junior Scientist Power Hour Slice of life comic thingy, humorous exaggerations
Kiwi Blitz A comic about robots, teenagers and mechs in a not that dystopian near future
Let's Speak English A slice-of-life by an American English teacher in Japan. She's also the one who makes Kiwi Blitz and Sleepless Domain
Loading Artist A bit of everything
Mary & Death Calvin & Hobbes-esque, very good
Next Town Over Steampunk, western
Phuzzy Comics Slice of life, currently on hiatus
Piled Higher and Deeper (PhD) a comic about academia
Red Moon Rising Fantasy
Sandra and Woo A rather nice comic about a girl and her pet raccoon
Saturday Morning Breakfast Cereal needs no introduction, right
Schlock Mercenary sci-fi
Semi co-op Boardgames
Sidekick girl Superheroes
Sleepless Domain Magical girl, but not quite. Still early.
Stranger Danger Slice of life
Sufficiently Remarkable Comic about everyday life of some people, with quite a bit of science
Tenko King A comic set in a Zelda-like world. Still starting up though
Tethered Post-apocalyptic
The Cloud factory On very long hiatus if not dead
The Forgotten Order Fantasy
Two Kinds Fantasy
XKCD If you don't know this...
Zoophobia Fantasy-ish