Since more and more users asked for it, I'm glad to announce native Plex server support for Yatse.
The support is still limited (No transcoding), labeled as beta and limited to unlocker owners.
If enough positive feedback a lot more stuff will be implemented, so if you are a Yatse user you may want to try and report back your feature requests.
I do not consider the implementation to be advanced enough to justify a purchase if you are not a Yatse or Kodi user, but feel free to ask about the features you'd like to have in an application like Yatse with Plex support.
Website: https://yatse.tv/redmine/projects/yatse
App link: https://play.google.com/store/apps/details?id=org.leetzone.android.yatsewidgetfree