Various

IZArc

http://izarc.org/

Archive utility supporting many compression formats. Alternative to WinZip and WinRAR.

PeaZip

http://www.peazip.org/index.html

Free and open-source archive utility. Good alternative to IZArc, but its translation is not complete.

Infra Recorder

http://infrarecorder.org/

CD and DVD burning tool. Alternative to Nero Burning Rom.

Java

http://java.com/en/

The Java Runtime Environment enable the use of software written with this language.

CamStudio

http://camstudio.org/

Create videos of the computer screen. Allows to annotate videos. This tool is very useful for creating demonstration videos and / or learning courses.

Virtual CloneDrive

http://www.slysoft.com/en/virtual-clonedrive.html

Creates a virtual drive that can read any CD or DVD image. Enable to use CD / DVD images downloaded from the Internet without burning them.

Game Booster

http://www.iobit.com/en/gamebooster.html

Improves the performance of games by temporarily disabling accessory Windows features.