This is an awesome online tool to create sprites for your game named SpriteStack.
You can find this online tool on this web page.
SpriteStack is a 3d pixel art editor based on the sprite stacking technique. Similar to voxels it's a fun and simple way to draw low-resolution 3d objects that can be later used in games or submitted to the online gallery.
The tool is easy to use and the output is good.
I use the free preview of Sprite Stack Studio but you can get one of the options to unlock all features from Steam or Itch.io website.
If you want to have full online access to the editor and exporter at a low price then use the Patreon website with just 2$ per month.
I find a good tutorial on youtube but you can see the videos from help webpage:
