Dulling Melodies said:

gifmaker.me, or kinemaster (If you don't mind a watermark, it allows music though) is what i use for my short animations/animation memes and gifs, along with procrstuff cheekse's animation help thing but procrstuff cheekse is (7?) dollars, but i'd say worth the price for such cheap one-time-buy software.

suchan said:

So my animations are made from a mash of two programs

(here's an example of my work if you want)

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I use firealpaca for the drawings (it has onion skin mode + autoplay so you can preview things)

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Wick editor to add music and mess with the frames. It has a timeline, so I can drag the frames to be longer or shorter to match the audio.

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Firealpace is free to download, and wick editor is on the browser!

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Krita also has animation, but you'll need FFmpeg to export the animation and I had no idea how to do that, haha.

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Macromedia flash is another, although I've never used it.

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All options are mainly for PC.