I've used libresprite and generally think it's very nice, but I'd really recommend using GIMP or Krita over it for most pixel art, learning those is useful outside of pixel art
I use GIMP and GrafX2 for my sprite art. The latter being an old-school type program in the tradition of Deluxe Paint.
Aseprite is the best tool for pixel art full stop
I use GIMP and GrafX2 for my sprite art. The latter being an old-school type program in the tradition of Deluxe Paint.