Notepad++ is a free (as in "free speech" and also as in "free beer") source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPLLicense.
Apache OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It can be downloaded and used completely free of charge for any purpose.
dig.ccMixter Music discovery site operated by ArtisTech Media, founded by Creative Commons. Offers free to use music, even in commercial projects and you only need to give credit to the musicians.
Convert is a free and easy to use unit conversion program that will convert the most popular units of distance, temperature, volume, time, speed, mass, power, density, pressure, energy, and many others, including the ability to create custom conversions!
GIMP is a free and open-source raster graphics editor used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks. This program has a similar feel to Photoshop.