Public - Group chats.
GoToWebinar - Webinar & Online Conference | GoToWebinar
nocnoc - Instant group chat invite via link
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Viber Communities - Group chat with up to 1B members, admin controls and more
WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing