Information About Go/Igo/Wei Qi/Paduk
Go Federations and Associations
International Go Federation
https://www.intergofed.org/
Nihon Ki-in
https://www.nihonkiin.or.jp/english/
Chinese Wei Qi Association (in Chinese only)
http://weiqi.sport.org.cn/
American Go Association
http://www.usgo.org/
European Go Federation
https://www.eurogofed.org/
British Go Association
http://www.britgo.org/
Go Rules
AGA Consise Rules
https://www.cs.cmu.edu/~wjh/go/rules/AGA.concise.html
Sensei's Rules
https://senseis.xmp.net/?BasicRulesOfGo
AGA's Collection of Rules
http://www.usgo.org/rules-go
Nihon Ki-in 1989 Revised Rules
http://www.cs.cmu.edu/~wjh/go/rules/Japanese.html
Chinese Wei Qi Association 1988 Rules
http://www.cs.cmu.edu/~wjh/go/rules/Chinese.html
World of Abstract Game's Go Variants
http://www.di.fc.ul.pt/~jpn/gv/gv.htm
Go Tutorials
Karl Baker's The Way to Go
http://www.usgo.org/way-go
Learn Go
http://www.learngo.co.uk/GoTutor/Tutor.php
The Interactive Way to Go - an interactive tutorial of the basics of the game, extremely good introduction
http://playgo.to/index-e.html
Go Programs and Servers
Igowin - free 9x9 board go program
http://www.smart-games.com/igowin.html
Cosumi - browser based go program
https://www.cosumi.net/en/
WING (World-wide InterNet Gokaisho) - go server
http://www.wing.gr.jp/
Online Go Server
https://online-go.com/
Go Quest Server - aimed at lower level players
http://wars.fm/go9
KGS (Kiseido Go Server)
AGA's List of Go Servers
http://www.usgo.org/go-internet
Assorted Go Pages
Sensei's Library - extensive collection of articles
https://senseis.xmp.net/
Sensei's Go Terms
https://senseis.xmp.net/?GoTerms
Tel's Go Notes - a nice collection of introductory essays on the game
http://www.telgo.com/
Go Base
http://gobase.org/
Go Base Go Proverbs
http://gobase.org/reading/proverbs/
Harry Fearnley's Go Page
http://harryfearnley.com/go/main.html
Fred Hansen's Go Page - rules, problems, other information
https://www.cs.cmu.edu/~wjh/