fvwm-window-search

https://github.com/gromnitsky/fvwm-window-search

A window switcher: search for windows interactively using a patched dmenu utility (the gem fetches & patches it during its installation). This was originally made for Fvwm, but it's been rewritten to work with any EWMH-compliant stacking window manager. Requires a preinstalled jansson-devel C library. It differs from rofi & co in that it activates (brings up) windows _during_ the search.