One of the better Atari 8-bit homebrew Ultimate conversions, Gunfright was ported by Mariusz, Jose Pereira, Emkay and Saul Cross in 2017. It plays pretty much the same as the ZX Spectrum original and looks similar to the Commodore 64 homebrew release of 2017. In fact there may be a connection between them since one of the people who worked on the C64 port also worked on this.
A list of all the official Ultimate Play the Game releases, plus known, completed homebrew conversions, remakes, and unreleased titles.
The Amstrad CPC received a conversion of Ultimate Play the Game‘s Filmation II game Gunfright in 1986 and it unfortunately suffers from the same problems that the previous Amstrad Filmation II conversion (Nightshade) did, namely: colour issues and slowdown problems.