サクラエディタ
https://sakura-editor.github.io/
japanese text editor. Has some japan specific functions that other text editors lack. Pretty fast. People that write era games often use it.

miku miku dance -- 3d dance editor

aviutl -- video editor

not sure what they use for yukkuri voices. You know, look at credits in any japanese video, they often credit the software they use.

American programs seem to milk consumers to use the latest hardware at all times, while japanese ones are slightly more outdated and target not extremely expensive hardware that people can actually afford. If anything, it's americans that can't program for shit and use slow hipster languages like python or ruby or java or c# for every sneeze.