What are some good tools for doing 1990s pixel art? Specifically sprites, but maybe some larger backgrounds. I see someone's done a JS version of DeluxePaint! Any others people really like?

Slightly heretically, I'd love one that handled alpha channels well.

Recs so far:

Aseprite
Pro Motion NG
grafx2
piskel
pyxel edit
Pixelorama
Cosmigo
Libresprite

My brain is very small, so starting with the #1 most common which is Aseprite.

@TomF Ase is great in general, but also because it has a pretty powerful CLI. I scripted it right into my asset build to split out various effect layers and send it all to my texture packer directly from the .ase files.