Open Source C++ Fan Control Software for Linux

This tool let's you control the frequency and fan settings of your AMD/ATI video card. It depends on the proprietary AMD/ATI Catalyst display driver and makes use of the AMD Display Library (ADL).

Phoebetria lets you take control of your BitFenix Recon fan controller on more operating systems than the official software. It offers all of the same features as the official software, with the exception of remote access, and has been tested on Windows, Linux, and OS X. The current plan is that future releases will add functionality and control that the official software does not provide -- giving you even more control over your fans.

Suite of tools for Buffalo NAS devices. Switch monitoring daemon, power management server and client, ACP server and fan control daemon.

Command line tool that uses AMD ADL OverDrive5 interface to control power and fan speed of their GPU boards. Look at the Wiki page about usage. Works on Windows and Linux (if video driver is loaded).