The most highly modular FOSS CMS that I know of. It has become a pleasure to work in this framework.
The opensource apache webserver, and its vast array of modules is my web platform of choice for most projects.
PHP, the new web work horse. Since most open source CMS projects are based on the LAMP architecture, I find myself coding PHP more often than not since about 2005
ASP.Net and visual studio are probably the easiest way to create a stateful application. Often times, if I need to make a windows based utility, or a quick and dirty mSQL implementation, I will choose to do it with asp.net
Developed on the Macintosh platform. I've been enjoying my Macintosh experience for nearly 10 years.
If you know a software engineer, then you know someone who should know a least a little Java
Love it or hate it, Javascript is here to stay. Tools like jQuery UI have made this task exponentially more enjoyable for both the end user and the developer
Perl, my old friend, like a blanket you coveted as a child. Perl was the first language I used on the web, and I still to this day, find some things are just done best in Perl
I had a couple projects this year that involved major Active Directory and Exchange related duties. I find that most everything I need to do for any underlying Microsoft middleware, requires Powershell. It's a great tool, and you can use any .Net class in your scripts.