Tablebases

Endgame Tablebases Online
A project to make 6-men Nalimov Endgame Tablebases available online on eD2K/KAD network
http://kd.lab.nig.ac.jp/chess/tablebases-online/

Free Downloadable Nalimov tablebases
Free Downloadable Nalimov tablebases from the Crafty FTP site
ftp://ftp.cis.uab.edu/pub/hyatt/TB/

A guide to endgame tablebases.
Answers common questions regarding the use of endgame tablebases.
http://horizonchess.com/FAQ/Winboard/egtb.html

Nalimov Tablebase Server
Online query of the server. All 3,4, and 5 piece endgames are available. For programmers; the service is also accessible from within your own application.
http://www.lokasoft.nl/uk/tbweb.htm