I knew the Animaniacs had games on Genesis and Super NES (and Game Boy), but I didn't know that there were other games for PC, PS1, GBA/DS, and even Gamecube, as late as 2005. Keep in mind this is a series which aired the bulk of its episodes in one season in 1993.
The original voice cast returned for these, including Pinky & the Brain and other characters.
The Animaniacs Game Pack for PC in 1997 is a minigame collection. It features animated cutscenes including a unique version of the theme song. Unfortunately these were animated by pixel artists rather than anyone who had any business animating the Animaniacs. Back in 1997, creating art on the computer was often seen as a completely different skill. Results are disappointing, though better than the 1999 Titanic parody "Gigantic Adventure."
2005's The Great Edgar Hunt for Gamecube looks like a decent collectathon in 3D, released only 12 years too late. There are plenty of 3D cutscenes with a watered-down attempt at the show's humor.
Animaniacs: Lights, Camera, Action! For GBA and DS is a cash-in isometric game without much to recommend it, but more than the PS1 title ...
Animaniacs: Ten-Pin Alley for Playstation is the real cash-in, being an Animaniacs-themed version of an existing bowling game. The animators briefly attempt to trace proper animation of the Warners before they transition into 3D. That's amusing, but not nearly as ambitious as Animaniacs Game Pack's version of the same gag.