Here you have a summary of the main features of these video conference (Free) solutions to help you work remotely.
For business day to day work, share screen and file sharing is a must have feature. Check out the number of video conference participants that can join on different applications.

Skype.com
*Multiplatform
*Voice call
*Video conference up to 10
*Web and mobile App
*Share screen
*Chat

Google Hangouts (hangouts.google.com)
*Multiplatform
*Video conference up to 10
*Share screen
*Chat

WhatsApp.com
*Multiplatform (apps and whatsapp web)
*easy to use
*video conference up to 4
*only from mobile App

Facetime
*only IOS (iPhone, iPad)

Microsoft Teams (teams.microsoft.com)
(comes with office 365)
*Multiplatform
*Voice call
*Video conference, live events up to 10000
*Share screen
*Host controls

Wire.com
(enhanced encryption)
*Multiplatform
*Voice call
*Video conference
*Web and mobile App
*Share screen
*Chat

Zoom.us
*Multiplatform
*Voice call
*Video conference up to 100
*40 min limit on the free version
*Share screen
*Host controls
*Recording

Instagram
*Multiplatform
*video conference up to 6
*you can use IG filters.