Envelope v1.0 for GEOS and the Commodore 64 / 128 by Spike Dethman (Dated May 13th, 1993) - Neat little desk accessory that lets you print out an envelope.  Can pull data from a text scrap, or you can type the address in yourself. 

Works in GEOS on the C64 and 128 in either 40 or 80 column mode.  Includes full Docs.