Daily dose of humor

Piled Higher & Deeper
A grad student comic strip.
I Can Has Cheezburger
lolcats for your lolz
xkcd
A webcomic of romance, sarcasm, math and language.

Software I use now and then

Graphics

Blender
Open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback.
GIMP
GNU Image Manipulation Program.
hugin
Panorama tools GUI.
enblend
Image blending with multiresolution splines, used together with hugin

Text editing

vim
Text editor with a fairly steep learning curve, not something that would make your average Windows user happy.
LaTeX
Creating typographically good-looking documents made easy. What everyone should be using...
Kile
LaTeX-IDE for KDE.
Kate
Another good editor.
Quanta Plus
KDE-IDE for web stuff.

GNU/Linux

Linux
I got tired of the instabilities of Windows, so switched to something different and never going back - unless someone forces me.
Arch Linux
Fast, no-nonsense Linux distribution, currently my favourite.
Fedora
I still keep a partition with the latest stable release.
KDE
And my favorite Desktop Environment.

Scientific/Programming

Intel Fortran Compiler for Linux
Yes, I know, its not open source, but that doesn't really matter (to me, at least).
Intel Math Kernel Library
For the occasional matrix inversion.
ROBODoc
Generates documentation in a variety of formats from source code. I use this because doxygen doesn't work with Fortran.
CMake
Cross platform makefile generator.
Python
I wrote some small scripts in python for Blender
PLPlot
Embeddable plot program (I use it together with Fortran and python)
Octave
Yet another Matlab replacement
Maxima
An open-source continuation of MACSYMA, the oldest symbolic number crunching software package.
Matlab
They really should get rid of the Java Virtual Machine, the GUI crashes every single time I use it on Linux...
Maple
Symbolic and numeric number crunching and this one even has a stable GUI.