1. https://apps.google.com/meet/ Accessed 15 June 2020
2. www.zoom.us Accessed 15 June 2020
3. https://www.microsoft.com/en-in/microsoft-365/microsoft-teams/group-chat-software Accessed 15 June 2020
4. https://www.webex.com/ Accessed 15 June 2020
5. https://www.gotomeeting.com/en-in Accessed 15 June 2020