X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.
PixBuilder - Free Photo Editing Software for PC
SteerMouse - Advanced driver for USB and Bluetooth mouses.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Logitech Options - Customisation of Logitech mouse or keyboard settings, device information, additional functionality...
Fotografix - In addition to being totally portable, Fotografix has a ridiculously small footprint.