HBO (Home Box Office)
(launched in 1972)
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I haven't seen much from this network because I've never really had access to it. But there are some things from HBO that I've seen elsewhere.

stuff I've seen
Fraggle Rock (1/10/1983 - 3/30/1987; I saw it on CBC)
The Ray Bradbury Theater (5/21/1985 - 5/28/1988; s3-6 aired on USA Network; I saw it on Amazon)
The Worst Witch (10/22/1986; TV movie; I saw it on VHS)
The Larry Sanders Show (8/15/1992 - 5/31/1998; I saw some of this on CBC)
The Tuskegee Airmen (8/26/1995; TV movie; I saw it on DVD)
The Comeback (6/5/2005 - 9/4/2005, 11/9/2014 - 12/28/2014; I only saw the first season, on DVD)
True Blood (9/7/2008 - 8/24/2014; I've seen a couple seasons on Amazon)
Last Week Tonight (4/27/2014 - present; I watch on YouTube)
His Dark Materials (11/4/2019 - 12/26/2022; also aired on BBC One; I saw it on DVD)
Watchmen (10/20/2019 - 12/15/2019; limited series; I saw it on DVD)

stuff I want to see
And the Band Played On (TV movie)
Angels in America (miniseries)
Animals
Attack of the 50 ft. Woman (TV movie)
Band of Brothers (miniseries)
Deadwood
Elizabeth I (miniseries; Channel 4, UK)
From the Earth to the Moon (miniseries)
Game of Thrones
The Josephine Baker Story (TV movie)
The Last of Us
Los Espookys
Lovecraft Country (Break Room of Geeks)
Norma Jean & Marilyn (TV movie)
The Penguin
Rome
Six Feet Under
The Tale (TV movie)
Tales from the Crypt
Westworld
probably some other stuff