gahtzee is a Yahtzee clone written in C and Gtk.
Gyahtzee is a gnomified version of yahtzee. It is based on a curses version released by orest zborowski in 1992.
Kiriki is an addictive and fun dice game for KDE, designed to be played by as many as six players. Participants have to collect points by rolling five dice for up to three times per single turn.
(commercial) In Maxi Dice you can play both normal Yahtzee, and the unique Maxi Yatzy, a game with six dice and more categories to put points in.
Open Yahtzee is a dice game which follows the original Yahtzee rules.
YahtzeeSharp is a Yahtzee game written in C#. It has been built using Mono/GTK# and uses XML to store data.