GoKnot as a games/problems edition tool:

Complete support of the SGF 4.0 standard
Conversion of older SGF versions
Edition of symbols, remarks, etc.
Game trees edition capacities: extracting individual branches, merging, cropping trees, etc.
Game maps!! A new idea. Click here to see a map
New realistic boards with customizable board and stone bitmaps
Reading of Panda-egg .UGF files
Writing of gobans as .BMP or .JPEG
Splits game collections to multiple files
Sketch gobans for testing on a copy
Complete editable timing game records
Easy annotation for SGF standards
Annotate remarks to nodes of a game being observed at IGS

As an IGS client, GoKnot has unique features, including:

Playing a game while the gke engine displays hints, you may ask "what if" questions, try variations on a sketch goban where the engine plays as your opponent ...
Observing multiple IGS games in multiple boards. Storing the games with complete timing records. You can observe up to 24 games simultaneously. Gobans can be floated, restored or resized by simple mouse clicks.

IGS (Internet Go Server) is a telnet based Go server where thousands of players from all over the world can meet to play and observe Go games. At any hour of the day, any day of the week, over one thousand is a normal number of connected players. Needless to say, it is fun and a great way to learn Go to connect to IGS. IGS can be found at IGS.
If you install GoKnot, it will connect you to IGS. For playing games, you must register at IGS to get a free account. (IGS is no longer free for all countries, check at IGS to see if you can get a free account.)

Platform: Windows 95, NT4, 98, 2000, Me, XP