Voice, Video & Text Chat Tools

Zoom <https://zoom.us/> -- video/audio/text web conferencing for meetings; with recording, screensharing; unlimited time for 1-on-1 conferences; 40-minute limit for groups of 3 or more; multiple webcams can be used; app Zoom Cloud Meetings can be downloaded for Android, iOS, and Windows.

Google Meet <https://meet.google.com/>  - text, voice, messaging; group chat up to 100 people; group voice or video call up to 10 people; can be synched with mobile devices (Android, iOS systems)

BigBlueButton <http://bigbluebutton.org/> -- video/voice (VOIP) conferencing tool with recording function; includes whiteboard, desktop sharing, presentation, web cam

WhatsApp <https://www.whatsapp.com/>

Facebook Messenger <https://www.messenger.com/>

Line <https://line.me/en/> -- free calls and messages; popular among Japanese students

WeChat <https://www.wechat.com/en/> -- popular among Chinese students

Skype <http://www.skype.com>

iVisit <http://www.ivisit.com> -- offers video conferencing and collaboration solutions for PC, Mac, and Windows Mobile phones

Google Voice -- access of Google Voice account right from  iPhone, iPad and iPod Touch; free text messages to US phones and low-rate international calls; download from iTunes