Recently I've been recruiting and I needed a spriter and NO ONE wanted to be one :(.
Story Time!(optional with basic pack):
So, I thought: "If you can't recruit them, become one!
So I googled "free spriting tools" and a list came up:
And the other ones don't matter
Now to help all the other gave dev's become spriters here it is!
It would be worth checking out GraphicsGale as well, which most industry artists use. It has the features of Piskel and a few others, and also became free as of two years ago. It's a program as opposed to a web app, though.
Solo artist and developer on Pokémon Secrets of the Ages. Project post coming soon!