The 2.5.1 version of Fluor for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X was originally created by Pierre Tacchi.
From the developer:
Fluor is a tool that allows you to automatically change the behavior of the keyboard's fn keys depending on the active application. Fluor lies in your status bar and makes you see instantaneously which mode your keyboard is on. A specific icon indicates that the keyboard's fn keys act like Apple function keys, and a different icon means that the keyboard's fn keys act like the good old functions keys (F1, F2, F3...).