IrfanView

IrfanView is a fast and simple image viewer and editor that supports all major graphic formats, including BMP, DIB, JPEG, GIF, animated GIF, PNG, PCX, multipage TIFF, and TGA. In addition, it features drag-and-drop support, directory viewing, TWAIN support, slide shows, batch conversion, and modifications, such as color depth, crop, blur, and sharpen.

GPU Shark

GPU Shark is a simple, lightweight and free GPU monitoring tool, based on ZoomGPU, for Nvidia GeForce and AMD/ATI Radeon graphics cards.

DivX Plus Codec Pack

The DivX Plus® Codec Pack includes everything you need to play DivX® or MKV files in third-party applications, like Windows Media Player. And if you're looking to stream your MKV videos from your Windows 7 computer to your PlayStation® 3 or Xbox 360, the DivX Plus Codec Pack can handle that too.