Latest versions:

Snitch 1.6.2 latest version (Pentium III or newer) or AMD64 (experimental !)

Snitch 1.2.4 (Pentium II or older)

Hagrid 0.7.56 latest version download

Hagrid Big Book (7MB) big opening book (Thanks to Leo to provide the required space on his site)

Both Hagrid and Snitch are chess engines only, they don't ship with their own GUI, so you should go for your favorite GUI:

Fritz 7 (commercial)
Arena (free)
Winboard (free)

As Hagrid and Snitch support both UCI and Winboard they should work with other GUIs as well.