Hiiii! I wanted to say I LOVE your sprite maker a TON. My names pyromantiic on Discord. I can't wait to follow whatever updates you provide! I wanted to show off just how much I loved it. I'm an artist, so I've been making custom edits and adding on where ever I could, but it was a downright shame when I saw that you could only export tokens or just solo frames for virtual tabletops. And though this won't work for anything other than Foundryvtt, I decided to put in a request!
I know a very kind module maker who has been working a bit on a walksprite module for Foundryvtt on request from me. His name is DylanIsSuperOkay on Discord. (He's done various work on modules for Pokemon Tabletop Reunited, which is where I had initially met him from). I reached out to him and put in a request for his module to support your sprite sheets, and, lo-and-behold, he did so!
So now, if you export the sprite sheet, enable the module, and post the entire walk/run/idle walksprite in, it will now run it in the Virtual Tabletop completely functional, pretty system agnostically. Meaning it can be used for anything from DnD to Pathfinder to Fabula, to whatever else you can think of.
The module in question: https://github.com/righthandofvecna/dylans-animated-tokens
And an example: (lower framerate not because it is that slow, but because that's the gif format from the conversion from mp4 hahah)
Please enjoy this little contribution to this amazing project you have going on here. And if you ever want someone to spam your DMs with accessory ideas and be able to provide concept art, my inbox is always open ;)