Formal:
* Tout cela - This literally means "all this" and is more formal.
* C'est tout - This means "That's all" and is a more concise way to say "this is all."
Informal:
* C'est ça - This means "That's it" and is a very common informal way to say "this is all."
* Voilà - This means "There you go" and can be used in place of "This is all" in some situations.
Here are some examples:
* "Tout cela est à vous." (This is all yours.)
* "C'est tout ce que je peux faire." (This is all I can do.)
* "C'est ça, j'ai fini." (That's it, I'm finished.)
* "Voilà, c'est tout ce que j'ai." (There you go, this is all I have.)
The best way to choose the right phrase depends on the context of the conversation.