Open Source or Freeware Software
Diagramming and Image Manipulation
Tool Home Page Comments
Dia http://live.gnome.org/Dia Dia is roughly inspired by the commercial Windows program 'Visio', though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.
Inkscape http://www.inkscape.org An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.
Gimp http://www.gimp.org GIMP is the GNU Image Manipulation Program.
 
Graphics / Icons
Tool Home Page Comments
Tango ! http://tango.freedesktop.org/ The Tango Desktop Project exists to help create a consistent graphical user interface experience for free and Open Source software.
Open Clip Art Library http://openclipart.org/ This project aims to create an archive of user contributed clip art that can be freely used.
 
IDE
Tool Home Page Comments
Eclipse http://eclipse.org Eclipse is an open source IDE Platform
Spket http://www.spket.com Spket IDE is powerful toolkit for JavaScript and XML development.

Note : Commercial and open source versions available.
Komodo Edit http://www.activestate.com/komodo_edit/ Komodo Edit is a free, open source editor for Perl, PHP, Python, Ruby, and Tcl, plus JavaScript, CSS, HTML, and XML, and template languages like RHTML, Template-Toolkit, HTML-Smarty and Django.

Note : Commercial Komodo IDE also available.
 
Utilities
Tool Home Page Comments
7zip http://www.7zip.org 7-Zip is a file archiver with a high compression ratio.
Filezilla http://filezilla-project.org/ FileZilla is open source FTP solution.
Img Burn http://www.imgburn.com/ ImgBurn is a lightweight CD / DVD / HD DVD / Blu-ray burning application.
Ant Renamer http://www.antp.be/software/renamer Ant Renamer is a free program that makes easier the renaming of files and folders by using specified settings. It supports Unicode names.
Mp3 Tag Tools http://massid3lib.sourceforge.net/ Free ID3 Tag Editing tool for Windows.
 
SQLite
Tool Home Page Comments
SQLite http://www.sqlite.org/ SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.
SQLite Browser http://sqlitebrowser.sourceforge.net/ SQLite Database Browser is a freeware, public domain, open source visual tool used to create, design and edit database files compatible with SQLite.
SQLite Manager http://code.google.com/p/sqlite-manager/ Manage all your sqlite databases using this lightweight extension for firefox, thunderbird, sunbird, seamonkey, songbird, komodo, flock etc. SQLite Manager is available as a XULRunner application too.