Global Television Network
(launched in 1974)
IMDb; official website; TV Tropes; Wikipedia

This is a Canadian network that I think mainly airs programs from other countries, like the U.S. I've never seen the channel, but I guess I've seen a bit of their original programming.

SCTV (9/21/1976 - 3/10/1979; s4-5 aired on CBC, s6 aired on Superchannel)
The Adventures of Sinbad (9/28/1996 - 5/24/1998; I saw a bit of this in syndication)
Andromeda (10/2/2000 - 5/13/2005; syndicated in the US, s1-4; Sci Fi, s5)
Mutant X (10/6/2001 - 5/17/2004; syndicated in the US)
Strange Days at Blake Holsey High (10/5/2002 - 3/26/2005; I saw this on Discovery Kids on NBC)
Houdini & Doyle (5/2/2016 - 7/4/2016; originally on ITV in the UK; I saw it on FOX)