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Your Babel box is for saying what languages you know, as well as what operating system, keyboard layout, web browser, desktop environment, and text editor you are most comfortable with. Details of how to use it for its original purpose, saying what languages you know, are at Misplaced Pages:Babel. Details of how to use it to say what technologies you use are fairly scattered, but a large assortment are at Category:Wikipedians by technology, or in Category:Wikipedians.
Template:Babel - Allows 1 to 100 boxes. Format: {{Babel|<box1>|<box2>|<box3>...}}
Template:Babel-N - Allows any number of boxes. Format: {{Babel-N |1={{User <box1>}}{{User <box2>}}{{User <box3>}}...}}
To specify a custom header, footer, or color add the parameters header=HEADER (default: Misplaced Pages:Babel), footer=FOOTER (default: Search user languages), and/or color=COLOR (default: white). Call the '!' userbox to start a new column after that point or the '-' userbox to insert a blank row. You may also use '|align=left' to display the babel box on the left side of the screen rather than the default right.