Synfig
Free and open-source animation software
2d
Noto Emoji
Noto Emoji is a collection of 3D pngs and 2D vector SVG, Lottie, WebP, and GIF assets.
Free and open source 2D and 3D game engine
Godot provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel.