Here are some popular forums:

Our Facebook page:
https://www.facebook.com/pivotanimatorofficial

Our Discord Server:
Pivot Animator Discord

In English:
TheDarkDemon Discord
The Pivot Animator Subreddit on Reddit
http://www.droidz.org/
http://swfanimationsinc.proboards.com/

En français (French):
http://pivot-land.forumactif.fr/
Pivot-Land Discord
Pivot at WorldAnim

En español (Spanish):
http://bluesticks.foroactivo.com/

Português brasileiro (Brazilian Portuguese):
http://pivot5.forumeiros.com/
http://pivotbrasil.forumeiros.com/
http://stickfunny.forumeiros.com/

Bahasa Indonesia (Indonesian):
https://www.facebook.com/groups/1413764978876379/

If you would like to add another forum please send us a link at support@pivotanimator.net