Informal:
* Salut tout le monde! - This is the most common and straightforward way to say "Hey everyone!"
* Coucou tout le monde! - This is a playful and friendly way to say "Hey everyone!"
* Yo tout le monde! - This is a very casual and informal greeting, similar to "Yo, everyone!"
* Hé les amis! - This means "Hey friends!"
Formal:
* Bonjour à tous! - This is a formal way to say "Hello everyone!"
* Bonne journée à tous! - This means "Good day to everyone!"
Other options:
* Salut les copains! - This means "Hey guys!"
* Salut les filles! - This means "Hey girls!"
The best option depends on the situation and the people you are addressing.