Piskel – A simple web-based tool for Spriting and Pixel art
The palette tools feel very clunky and primitive.  I'd expect there to be a very simple way to add the current color to a palette, but I can't figure out how.  More importantly, I expect that modifying a color in the palette would also affect all the pixels that use said palette entry!  Instead, they retain their old color.  Also, it would really help if I could freely arrange palettes all in their own windows, like this:<p><a href="https://i.imgur.com/UHtBlbk.gif" rel="nofollow">https://i.imgur.com/UHtBlbk.gif</a><p><a href="https://i.imgur.com/LYbZagv.gif" rel="nofollow">https://i.imgur.com/LYbZagv.gif</a><p><a href="https://i.imgur.com/oOaR6x5.gif" rel="nofollow">https://i.imgur.com/oOaR6x5.gif</a><p>Unfortunately a pixel graphics editor that has lackluster palette tools is a non-starter for me so I didn't even bother with looking at the rest of the features...