X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.
SteerMouse - Advanced driver for USB and Bluetooth mouses.
Logitech G Hub - Logitech G HUB is new software to help you get the most out of your gear. Quickly personalize your gear per game.
Logitech Unifying Software - Add devices to your Unifying receiver. This software will allow you to add or remove compatible mice, keyboards and other devices to your unifying receiver. The tiny receiver stays plugged in.
Karabiner - Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X.
Artemis RGB - An overview of the guides that'll teach you how to use Artemis