JA2 Stracciatella is an unofficial patch for Jagged Alliance 2. But it's more than that: The goal of JA2 Stracciatella is to make Jagged Alliance 2 available on a wide range of platforms, improve its stability, fix bugs and provide a stable platform for mod development. Development of JA2 Stracciatella takes place on GitHub.
JA2 Stracciatella supports high resolutions. Any reasonably resolution should work. In this screenshot, the game runs at 1920x1080.