I haven't seen a new release of an animation editor in a long time. Would be cool to see someone such as Displee come out with one. I am about to scour the web for you for a copy. What do you mean by "free release, not a leak"? It will help me pinpoint what you may be after.
EDIT: Reason why I haven't seen an animation edit in a long time is because I haven't been looking. Wow there is some great new ones out that I haven't seen.
EDIT2:
https://www.rune-server.ee/runescape...3-rsposer.html
NOTE: Read 2nd post and 4th post in the thread.