Informal:
* Ça va ? (pronounced "sa va?") - This is the most common and literal translation, meaning "How are you?"
* Quoi de neuf ? (pronounced "kwah duh nœf?") - This means "What's new?" and is a more casual way to ask what's going on.
* Comment ça va ? (pronounced "koh-moh sa va?") - This also means "How are you?" but is slightly more formal than "ça va?"
More specific:
* Comment vas-tu ? (pronounced "koh-moh va-tu?") - This means "How are you?" and is used when addressing someone you know well.
* Tout va bien ? (pronounced "too va bee-en?") - This means "Is everything alright?" and can be used as a polite inquiry.
Other options:
* Salut, quoi de neuf? (pronounced "sa-loo, kwah duh nœf?") - This means "Hi, what's new?" and is a friendly way to start a conversation.
* Alors, quoi de neuf ? (pronounced "a-lor, kwah duh nœf?") - This means "So, what's new?" and is a slightly more formal way to inquire.
The best translation depends on the situation and your relationship with the person you're talking to.