I've been using Macromedia Flash and then CS5.5 for the time being but a few days ago, the serial from Animate Archive expired. So I have a few options on my computer: Krita, and OpenToonz. I made a poll back on YouTube where you can vote on right here - https://www.youtube.com/channel/UChQKVdKqk3Ji1qNEVBcKkNg/community?pvf=CAI%253D