Houseparty - https://play.google.com/store/apps/details?id=com.herzick.houseparty
Hangouts - https://play.google.com/store/apps/details?id=com.google.android.talk
Skype - https://play.google.com/store/apps/details?id=com.skype.raider
Cisco Jabber - https://play.google.com/store/apps/details?id=com.cisco.im
Marco Polo - https://play.google.com/store/apps/details?id=co.happybits.marcopolo
origin - https://www.pipiscrew.com/?p=17645 video-conferencing-applications