Do you know the you can do all of your production in an AS3 FLA, with Keyframe Caddy if you want, and only change to HTML5 Canvas at the end? You do have to become familiar with features that won't work in Canvas, but otherwise it should work out ok.
Yes there are a number. One is called Lipper Flash Tools – animonger
and another is called Thumbnail Plugin from TrickOrScript - The ultimate plugins for Flash animators.
Also the AnimSlider Pro on the same page is extremely useful.
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I know this post is a year old, but if you are now using Animate CC 2017 there is no need for Keyframe Caddy because Adobe added this function with the Frame Picker window. Just make sure in the Frame Picker window to set the drop-down menu to Single Frame rather than Loop (took me a bit to figure it out). The creators of Keyframe Caddy went out of business in '16 or '15 so they are no longer releasing updates. Hope this helps.