VLC Media Player : a media player that can read the most common media formats.
Audacity : a free audio editor that records, plays sounds, imports and exports WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using cut, copy and paste, mix tracks together, or apply effects to your recordings. NB to create MP3 files, you will have to download LAME MP3 Encoder Library from the same website. Audacity also enables you to record streaming audio.
XnView : a freeware to view and convert graphic files (freeware).
Gimp : Image manipulation program (freeware).

Macromédia Flash Player and Shockwave Player will allow you to open animated web pages.

J2SE Runtime Environment : Java environment.
Calibre Ebook Management : Ebook converter.
Adobe Acrobat Reader : Adobe Reader is free and lets you view and print Adobe PDF files.
PDF Creator : to create PDF files from nearly any application.
CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system.
Defraggler : for files and disk defragmentation.
Hot Potatoes : The Hot Potatoes suite includes five applications, enabling you to create interactive exercises. Hot Potatoes is freeware (no further development from June 12th, 2013).