ccBoxes offers three completely customisable dialog controls to SF users. Brilliant if you're involved in localisation.
ccAlert allows the title, icon type, message, and up to three buttons to appear on an auto-sizing form. For aesthetics, buttons are of a fixed size, but text is automatically truncated.
Use ccMsgBox or ccPrompt where you would normally use a MsgBox or Prompt, and specify the language of your destination locale for the correct language to appear, regardless of the OS language!
Language for a handful of countries can be specified by using a function named after the language. For example - French: use ccFrMsgBox and ccFrPrompt exactly like you would use MsgBox and Prompt with the language always in French!