Rpg Tools now also supports sprites from the artist Engvee who created a couple of animated, isometric sprites, you can find his page here : https://engvee.itch.io/

As for other models you can view all animations, change settings like the playback speed and export them with a lot of options.

If you are interested in using Rpg Tools you can find it here : https://nightmare-82.itch.io/rpg-tools

If you are interested in a version which includes a content package you can find it here :  https://nightmare-82.itch.io/rpg-tools-content-package