Well, it doesn't have the "S" part of FPS quite yet, but Benjamin Joffe has developed a browser-based JavaScript "3D walker". It requires a browser that supports the ...
OpenStrike is a Counter-Strike clone built for the PSP, and the project is already running at 60 FPS with bot rounds.
OpenStrike porta scontri con bot a 60 FPS e 480x272 sulla PSP originale, grazie a un motore Rust da circa 12 MB e a un'API JavaScript aperta.