11.22.63, on Hulu
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An 8-part limited series on Hulu, based on a book (which I haven't read) by Stephen King, who serves as executive producer, along with J.J. Abrams (and a couple of other people). When I first heard of the series in 2015, I had some interest in checking it out, but by the time it premiered in February 2016, my internet had been too slow to watch anything on Hulu for awhile. But then I learned that it's only available to Hulu subscribers, so I wouldn't have been able to see it even if I had fast internet. Still, I do hope to see it someday.
Battlestar Galactica: Blood & Chrome
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This is a 10 episode prequel to Battlestar Galactica, which first aired online (at Machinima.com) in 2012. In 2013, it aired as a TV movie on Syfy. It's not officially online anymore (though I'd be shocked if you couldn't find it), but it's been released on DVD. I never saw it either online or on TV, but I'd probably like to do so, someday.
Dimension 404, on Hulu
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A sci-fi anthology series from RocketJump, which has done other webseries I've really liked. I'm sure it'll be great, and I really wish I could watch it, but I don't currently have access to Hulu.
Lost in Space, on Netflix
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A 2018 reimagining of the old 1960s series Lost in Space. I'd definitely like to check it out, but I don't get Netflix.
Sense8, on Netflix
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I haven't been able to see this, because I don't get Netflix.
Star Trek: Discovery, on CBS All Access/Paramount+
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This is set about ten years before the original Star Trek, and as far as I know, it's meant to be canonical within the continuity of all the Trek TV series (but not the rebooted film series). The pilot aired on CBS in September 2017, but the rest of the series was only shown on the subscription streaming service CBS All Access, which I don't get. So I decided not to watch the pilot. Hopefully someday I'll get to watch the series on DVD.
Star Trek: Phase II
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Formerly known as Star Trek: New Voyages. This is a fan-made continuation of the original Star Trek TV series. Since 2004, eight episodes have been released (as of 2014). I've never seen any of it, but I suppose I must have been vaguely aware of it. Maybe one of these days I'll check it out. I should say there are numerous other, unrelated fan-made series based on Star Trek, any of which might potentially be of interest to me, but this is probably the one I'm most likely to check out. Someday.
Star Trek: Picard, on CBS All Access/Paramount+
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I don't know any specific details about this and I don't really want to. But I definitely want to see the show someday.
Star Trek: Strange New Worlds, on Paramount+
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A spin-off of "Star Trek: Discovery".