Open Source tools and utilities

Besides the main applications most people use, there are many small applications and utilities that at a given moment in time are required to perform specific jobs. Below is a list (by no means complete) of useful applications I have used, mostly Open Source:

Office Applications
OpenOffice - The Open Source alternative to Word, Excel and PowerPoint

Development Environment
StarUML - Editor of Unified Modelling Language Documentation
Eclipse - The most complete Open Source Development Framework
Cygwin - Unix emulator on Windows
Proxomitron - Local Proxy. Very useful for tracing communication issues

Audio and video
Audacity - Free audio editor
Ffmpeg - Free video editor and converter
Mencoder - Another free video editor and converter
divxplayer - DivX Player

Web Server
Apache - Of course
Tomcat - Java application server
Joomla - Content management system with thousands of extensions
GSiteCrawler - Sitemap generator

DataBases
PostgreSQL - Open Source, powerful and stable DBMS
MySQL - Currently, the ubicuous Open Source DBMS
Power*Architect - Database Modelling Tool

File Transfer
Filezilla - Open Source GUI FTP client.
eMule - Peer to Peer Utility

Programming languages
PHP
Perl
Java

Other
Daemon Tools

Even for a web site with a few pages, a content management system is an important tool to help create and structure the site content, to ease the creation and maintenance of common elements (header, footer, menus,...) and to ensure it complies with standards.

Joomla is the Open Source CMS that best covers my expectations.