Uno
The classic Uno game & a more adventurous version are available to be played among groups, in teams and you can even host a tournament!
Scattegories
https://play.google.com/store/apps/details?id=com.magmic.android.squash&hl=en
https://apps.apple.com/us/app/scattergories/id1011376303
This category game allows you to host a challenge between a closed group of people (by sharing a code).
Words/Crosswords/Chess/Boggle With Friend:
https://www.zynga.com/games/words-with-friends-2/
This website has 4 different games which can be played online between people. Most are one-to-one games but you can use them by creating teams.
Kahoot!: https://kahoot.com/
Kahoot! makes it easy to create, share and play learning games or trivia quizzes in minutes. You can host a live Kahoot! by sharing a screen while participants answer on their devices.