"Vous" is the first one that comes to mind in french. But since it is also a more formal (and/or "respectful") version of "tu/toi", it can both designate a group of people or a single person, depending on the context (just like "you" in English). Sometimes people will use "vous tous" (literally "you all") to make this clear.

It is a little better than the "you" situation in English since if you are speaking with someone that is not using the singular form of "vous" to speak about you (which is basically anyone you are familiar with unless they are your boss or In-laws and kind of oldschool), it is instantly clear what they mean at least.

In Portuguese (especially Brazilian), there are singular and plural forms of "you": "você" (singular) and "vocês" (plural). In English, "you" behaves like a plural because it's followed by "are" instead of "is". The only exception I can see is "yourself" and "yourselves" that refer to both singular and plural forms.

However, In Portuguese, even though we have "vocês" as plural form, we also use "vocês todos" or "todos vocês" ("you all"/"all of you") sometimes.

Spanish has "Ustedes" (except in Spain, they use "Vosotros/Vosotras")