http://sabaki.yichuanshen.de
An elegant Go board and SGF editor for a more civilized age.
https://gogameguru.com
Get commented pro games, articles, Go problems and advice to help you improve more quickly. Enjoy the latest Go news, professional games and more. Join over 10,000 people and get weekly updates.
http://senseis.xmp.net/?GoTeachingLadder
The Go Teaching Ladder is a site where you can have your own games reviewed. Includes many already commented games.
http://www.moyogo.com
Automatic, instant Go pattern expert & relational Go game database
http://gowrite.net
GOWrite is a full featured SGF viewer, editor and publishing tool for game of Go known in japanese go(囲碁), Chinese weichi(围棋), or Korean baduk(바둑). GOWrite is freeware.
http://gogrinder.sourceforge.net
GoGrinder is a Java program for practicing go problems. It uses problems in SGF format. 347 problems are included in the install, and thousands more are easily downloadable (pointers in the documentation).
http://www.godrago.net/en.htm
Browse and edit files, print and export, and play against GnuGo.
http://webpages.charter.net/suewilcox/Sector.htm
Sector Fights are battles over containment, be it of a potential territory or a weak group. Sector Fights happen throughout the opening and midgame and their results are crucial.
http://webpages.charter.net/suewilcox/Contact.htm
Contact happens often throughout a game and most players screw it up royally. One sees dan players making mistakes with rules a 20 kyu could master.
https://www.yutopian.com/yutop/cat?product=ETGAE&category=Ein
Best introduction to the game of Go. Requirements: 486 or better, Windows 95/Windows NT, XP or higher. Not for Window 7.
https://www.yutopian.com/yutop/cat?product=ECFME&category=Ef
Best tool to learn Fuseki with lessons on basics, and 16 most common fuseki including the Shusaku Fuseki, Cosmic Style, Nirensen, Kobayashi Style, Chinese Fuseki, etc.
https://sjeng.org/leela.html
Leela is a strong Go playing program combining advances in Go programming and further original research into a small, easy to use graphical interface.