Messenger Video Calls - Facebook Messenger, now with HD video calls
ClickMeeting - Collaborate with partners and clients using ClickMeeting professional web conferencing software. Try it now, FREE!
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Zoho Cliq - Team chat that's built for work
CallKite - Your website’s video call center in just one click.
GoToWebinar - Webinar & Online Conference | GoToWebinar