ImageReady isn't a separate thing any more
but instead it's built directly into Tattyswap. if you have access to any version of it, open the animation timeline panel and you'll recognise the IR interface.
I've not done very much animation without Photoshop, and what little I did I used really basic stuff like drawing each frame individually then combining them into a single animated file using a command line tool like APNG.
Despite the name, Pixelmator has nothing directly for animation. Krita, which I keep meaning to learn to use 'cause it's free, apparently has pretty much what you're after: docs.krita.org/en/user_manual/animation.html
Their interface is a bit weird which is why I've not gotten as deep into it as I'd like to, but if you're happy to stick with it then it might be just what you need
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Mon 23 Dec, 2:03,
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I've not done very much animation without Photoshop, and what little I did I used really basic stuff like drawing each frame individually then combining them into a single animated file using a command line tool like APNG.
Despite the name, Pixelmator has nothing directly for animation. Krita, which I keep meaning to learn to use 'cause it's free, apparently has pretty much what you're after: docs.krita.org/en/user_manual/animation.html
Their interface is a bit weird which is why I've not gotten as deep into it as I'd like to, but if you're happy to stick with it then it might be just what you need