Color Tool

Great website for webdevelopers or for calibrating your monitor.

http://www.easyrgb.com/harmonies.php

JDiskReport

JDiskReport enables you to understand how much space the files and directories consume on your disk drives, and it helps you find obsolete files and folders.

The tool analyses your disk drives and collects several statistics which you can view as overview charts and details tables.

It's ad- and nag-free uncrippled binary multi-platform software that is free of charge and that never expires.

For more infomation about the features, please click here.

Download it from here.