Yes, it's called Minecraft...
It has classes like
GuiButton
and
GuiCheckBox
. You can use those in your own GUI instead of making your own.
There is also a library for Minecraft which you can use. It's called Forge...
It adds a simpler way of opening your GUIs, as well as a lot of other utilities which you can use to make your modding life easier.
Seriously now, what do you want more?