FIFE (Flexible Isometric Free Engine) is an open-source 2D game engine for isometric RPGs, written in C++ with Python scripting. It supports tilemaps, sprites, and pathfinding, ideal for games like Fallout 1. FIFE targets Windows, macOS, and Linux, with a focus on retro aesthetics. Its editor allows map and asset creation, though it’s less polished than modern engines. The community is small but provides documentation. FIFE’s niche focus limits 3D support, but it’s perfect for indie developers recreating classic isometric games. Its flexibility and Python integration make it suitable for hobbyists, though maintenance is sporadic.