Hanna-Barbera was an animation company whose roots were planted in the partnership of Bill Hanna and Joe Barbera, who got their start at MGM directing the famous Tom & Jerry cartoons. When MGM closed down its cartoon devision in the late 1950s, Bill and Joe started up a cartoon company of their own and began making cartoons for television, albeit in lower quality than what audiences had seen in theaters. From 1958 all the way through 2001 (when Bill Hanna died, at which point the studio was folded into Warner Bros. Animation), Hanna-Barbera produced so many cartoons, it's extremely difficult to remember every single one of them. Seriously, has anyone here actually heard of Goober and the Ghost Chasers? Obviously, they were more about quantity than quality.
As of the 1990s, Hanna-Barbera is owned by Turner Entertainment, which merged with Warner Bros. in 1996. Unfortunately, as a result of this, ever since 2002, Warner Bros. seems to hold the Hanna-Barbera cartoons (especially the overhyped Scooby-Doo) in higher regard than their own cartoons (i.e. Animaniacs, Freakazoid and Histeria).
With particular emphasis on those seen in YouTube Poops