General:

Open Office
Mozilla Suite
Acrobat

Anti-Spyware:

Ad-aware

Educational:

Studyminderlite – Student organizer http://www.studyminder.com/

Typing Tutors:

http://www.kiranreddys.com/products/typing.html http://typefaster.sourceforge.net/

Web Design:

NVU (New View) – Free and Open Source Desktop Software for HTML Authoring and Publishing http://www.nvu.com/
NVU is considered by those who evaluated it in the OpenCourseWare project to be a very useful tool for creating HTML documents and publishing them to the Internet.
Nvu’s claim to fame is its WYSIWYG approach. Based on the code for Mozilla’s Composer component, Nvu adds enhancements, such as a site manager, a CSS editor (based on CSS), inline style support, forms, customizable toolbars, and tabbed editing of multiple files.
NVU is available for Windows and Linux operating systems

Paint.net – Photoshop/Paint clone http://www.eecs.wsu.edu/paint.net/