JEOPARDY!  
    (MB 1964) Thirteen Editions
The last edition of this original home version is numbered 14th Edition but as they did for Password and Concentration, MB bowed to superstition and did not release a 13th Edition.
    (Pressman 1986) Two Editions, plus Travel, Junior and 25th Anniversary
    (Tyco 1993) Also Masters Edition and two Travel Editions [Alex]
The Masters Edition is essentially a second edition of the basic game, in similar packaging.  The second Travel Edition was also called Masters Edition.
    (Parker Brothers 1999)
    (Pressman 2003) Regular Edition and The Simpsons Edition
Both the regular edition and the Simpsons edition were also released in tin cases in 2006.  A travel sized version appears to have been released ONLY in a tin case.
    (University Games 2005) Can You Beat Ken? [Ken Jennings on cover]
A trivia game which lets you match wits with the long-running Jeopardy! champion.  Not licensed by Jeopardy! but still of interest to its fans.
    (Pressman 2008) ESPN Jeopardy! COMING FALL 2008 - ANNOUNCED AT TOYFAIR
According to one report, the ESPN game will also be offered in a "travel friendly attache cased" version.