YTV
(launched in 1988)
IMDb; official website; TV Tropes; Wikipedia

This is a Canadian network that I've never actually seen, but some of the shows I watch on American networks originated here (or aired more or less simultaneously here and on American networks). It has also acquired shows from other countries, such as the U.S., but I'll only be listing original YTV series (and co-productions)

The Big Comfy Couch (3/2/1992 - ?/?/1996; further seasons aired on Treehouse TV; aired on PBS in the US)
ReBoot (9/10/1994 - 1/24/1998; aired on ABC in the US; followed by 2 TV movies in 2001)
Caitlin's Way (3/11/2000 - 4/28/2002; originally aired on Nickelodeon in the US)
The Zack Files (9/17/2000 - 5/5/2002; aired on Fox Family Channel in the US)
Martin Mystery (10/1/2003 - 3/27/2006; aired on Nicktoons in the US)
Jane and the Dragon (10/15/2005 - 8/12/2006; aired on NBC in the US)
Anne of Green Gables (2/15/2016; TV movie; aired on PBS in the US)
Anne of Green Gables: The Good Stars (2/20/2017; TV movie; aired on PBS in the US)
Anne of Green Gables: Fire & Dew (7/1/2017; TV movie; aired on PBS in the US)