LemonFree's used cars classifieds has provided mirrors of the following projects free of charge.
Apache Software Foundation Distribution Directory - We run on apache and we think you should too.
Putty - A really handy Telnet and SSH utility for Windows and Unix. We've been using it for years and find it extreamly realiable.
linuxgazette - The Free International Online Linux Monthly
The Linux Documentation Project - A comprehensive collection of linux info and how-to's.
The Comprehensive R Archive Network - If you need to graph/model statistics then you should check out the R Archive.
Open MPI - A High Performance Message Passing Library.
Open SSL - A very robust Secure Socet Layer toolkit.