Win32 QuakeForge binaries compiled using Borland C++ can be found here.

You can find a version of CVS on Cyclic's ftp server.
Grab ssh 1.x so you can access shell1.sourceforge.net. You can get either OpenSSH or a less free SSH
here is an official Cyclic Windows release of CVS.
Personally I think my
WinCVS/MacCVS is now available for Linux as gCVS and a copy can be found here.
Pharmacy is a GUI front-end to CVS in X11, it looks quite useful.
Get a copy of the latest GCC compiler (latest is GCC v2.95): ftp://ftp.gnu.org/pub/gnu/gcc
The GPL Quest Map editor which can edit Quake maps and runs on multiple OSs has a Linux version in the Quest project's CVS tree, this is a tweaked version by Nelson Rush (palisade) which fixes a lot of the problems inherent in the CVS version. You have to edit the quest.cfg before using it. Email Palisade for questions or comments.

For Windows users, Putty is a good program that will allow you to telnet into your shell1.sourceforge.net account using SSH 1.x.
There is a port of unix cvs, ssh and scp to Windows (console only) here.
Grab Palisade's batch file to make using the Windows commandline port of scp with sourceforge easier.
Grab Palisade's batch file to properly set up the Windows commandline port for ssh and cvs.
You can find WinCVS here: http://www.wincvs.org/.
Some useful gnu tools for Win9x/NT users are here: ftp://ftp.fe.up.pt/pub/Projectos/em96115/gnu-win32/misc.
Cygnus GNU GCC Environment for Win32 is here: http://sourceware.cygnus.com/cygwin.
DJGPP - 32-bit DOS port of GCC 2.95 compiler can be found here.
There is a cvs port for DOS here which requires cwsdpmi but there is no known ssh port. Sourceforge requires cvs to use ssh to login.

You can find MacCVS and WinCVS here: http://www.wincvs.org
There are currently two different SSH clients for Mac: Nifty Telnet SSH and F-Secure SSH Client.