CAST links:
CAST supports Slackware Linux and IRIX through mirrors of current Slackware .isos and the Nekochan IRIX repository.
External links:
Security in-a-box
http://security.ngoinabox.org/
Security in-a-box has great information on configuring your workstation.
Ninite
http://ninite.com/
Ninite allows you to install several common software packages quickly, configured for your machine, and to avoid browser toolbars and other junk.
PortableApps
http://portableapps.com/
PortableApps lets you load software apps on a USB drive, and run them wherever you happen to have a PC available.
7zip
http://www.7-zip.org/
7zip is a free file compression package.
Malwarebytes
http://www.malwarebytes.org/
Antivirus program. Free version doesn't do real-time scanning so, you'll want to run something else for day-to-day use. But, this seems to fix things others don't.
Media player alternatives
http://www.free-codecs.com
PDFCreator
http://sourceforge.net/projects/pdfcreator/
PDFCreator easily creates PDFs from any Windows program. Use it like a printer in Word, StarCalc or any other Windows application.
PuTTY
http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator.QuickTime alternative
http://www.free-codecs.com/download/QuickTime_Alternative.htm
QuickTime alternative
http://www.free-codecs.com/download/QuickTime_Alternative.htm
Real alternative
http://www.free-codecs.com/download/Real_Alternative.htm
Sumatra PDF
http://blog.kowalczyk.info/software/sumatrapdf/download.html
Open source .pdf reader. Replaces Adobe Acrobat Reader.
VLC
http://www.videolan.org/
VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols.