in chronological order (note that some of them will overlap):

Batman the animated series
Batman Adventures
Batman Mask of the Phantasm
Superman the animated series
Superman Adventures
Batman & Robin Adventures
Batman/TMNT Adventures
Batman Subzero
Batman Adventures the Lost Years
The New Batman Adventures
Gotham Adventures
Gotham Girls
Batman Rise of Sin Tzu
Batman Gotham Adventures
Static Shock
Mystery of Batwoman
Justice League
Batman Adventures 2003
Justice League vs the Fatal Five
Batman and Harley Quinn
Harley Quinn and Batman
Justice League Unlimited
Shelved JLU continuation: https://twitter.com/aaron_sparrow/status/1175589724326490117
upcoming comic by Paul Dini: https://www.newsarama.com/49029-paul-dini-returns-to-batman-the-animated-series-in-comics.html
Batman Beyond
Batman Beyond (comics)
Return of the Joker
Zeta Project

First let's adress the elephant in the room:
- YES Batman & Harley Quinn is canon, it doesn't please me either but we must cope
- NOT all of the issues of some of the comics are canon
- Justice League Adventures and Batman Beyond 2.0 are DEFINITELY NOT canon