FIM, the FBI Improved image viewer, offers a Vim‑like, keyboard‑driven interface for browsing photos on Linux and other Unix systems. Developed by Michele Martone, it bundles optional libraries to stay lightweight while supporting full‑screen, SDL, framebuffer, and ASCII modes.

The tool reads EXIF metadata and custom description files, letting users annotate thousands of JPEGs with captions and tags. A single command launches a directory, and key bindings navigate, zoom, rotate, and flip images without leaving the terminal.

FIM’s scripting language, exposed through a .fimrc file, lets power users tailor status bars and filter galleries by metadata. By keeping dependencies minimal, the project stays fast and portable to WebAssembly and Android via Termux.