http://www.centerforinquiry.net/forums/viewforum/29/
A simple paranormal forum. Seems fairly active.
http://www.unexplained-mysteries.com/forum/forum/10-ghosts-hauntings-amp-the-paranormal/
Seems to legit though I would read through some posts before posting on your own. Includes spirit and energy info.
http://paranormalforum.net
Appears to be somewhat a rp. Not sure just from certain topic areas. Has info on time travel (wtf?) And AI's???
https://botw.org/top/Society/Paranormal/Chat_and_Forums/
Seems the most trustworthy.
http://www.paranormal-encyclopedie.com/forum/
Spanish option.
http://www.anybodythere.net/psychic-paranormal-forum/index.php
Psychic forum.