The open-source, free, standards compliant web browser
Web Developer (Firefox Plugin)
Firebug (Firefox Plugin)
Notepad++ is a free text and source code editor and Notepad replacement that supports several languages.
The free, open source image manipulation program with capabilities similar to Photoshop and Paintshop Pro.
A free, open source office suite that for most people is a far better and cheaper option than Microsoft Office. OpenOffice Draw is free alternative to expensive products such as CorelDraw.
Oracle SQL Developer
Oracle SQL Developer is a free and fully supported graphical tool for database development. With SQL Developer, you can browse database objects, run SQL statements and SQL scripts, and edit and debug PL/SQL statements.