YY-CHR is a program intended for editing graphics in video game ROMs, but i often use it for all kinds of non-video game pixel art. its feature set is kinda limited, and the old version i use doesn't support palettes greater than 16 colors or a canvas larger than 128x128 pixels, but i kinda like it that way
The .NET version can increase the canvas size (256x256, might go higher?) and support 8bpp formats for 256 color palettes 👀
