This is where I play around with various packages. Most of them are in some way related to the needs of a theoretical biophysics research group.
Feedback and bug reports are welcome!

CCP4 exists to produce and support a world-leading, integrated suite
of programs that allows researchers to determine macromolecular
structures by X-ray crystallography, and other biophysical techniques.
CCP4 aims to develop and support the development of cutting edge
approaches to experimental determination and analysis of protein
structure, and integrate these approaches into the suite. CCP4 is a
community based resource that supports the widest possible researcher
community, embracing academic, not for profit, and for profit
research. CCP4 aims to play a key role in the education and training
of scientists in experimental structural biology. It encourages the
wide dissemination of new ideas, techniques and practice.

This package contains an LGPL-licensed subset of the full CCP4 suite.

GGobi is an open source visualization program for exploring high-dimensional data. It provides highly dynamic and interactive graphics such as tours, as well as familiar graphics such as the scatterplot, barchart and parallel coordinates plots. Plots are interactive and linked with brushing and identification.

Nagios is a program that will monitor hosts and services on your
network. It has the ability to email or page you when a problem arises
and when a problem is resolved. Nagios is written in C and is designed
to run under Linux (and some other *NIX variants) as a background
process, intermittently running checks on various services that you
specify.

The actual service checks are performed by separate "plugin" programs
which return the status of the checks to Nagios. The plugins are
available at http://nagios-plugins.org/.

This package provides core programs for Nagios. The web interface,
documentation, and development files are built as separate packages.