I loved the cartoon ReBoot, it was the first completed computer-animated cartoon. I also like one called Freakazoid, although maybe that wasn't for kids. And not so obscure but The Animaniacs was a great TV cartoon show, and The Tiny Toons.
Loads. How obscure do you want? One of my favourites as a kid was a cartoon called Robot Planet. My husband loved it too but we have yet to find anybody else who remembers it and can't find it on YouTube, dvd or video.