Screen sharing and video calls are very important in now a days. This could be either for business reason or trouble shoot the issues.There are many sites offering these services some are free and rest are paid one. Below sites are best free screen and video calls site in terms of quality.
- https://appear.in/
- https://hangouts.google.com/
- http://www.ammyy.com/
- https://www.skype.com/en/
- https://zoom.us/feature/share
- http://www.teamviewer.com
Above screen sharing tools and video sharing tolls are very free in some extent. We can even arrange a meeting with this