Latest Versions (not open source)
Linux: vers. 1.4.1 (sept.'08) Windows: vers 1.4 (feb.'06) MacOS: vers. 1.4 (feb.'06)
http://www.pandanet.co.jp/English/glgo/
Features
Its features include:
Tabbed view
A fancy 3D goban display. The board can be rotated and zoomed
A classic 2D goban display
Full-screen mode (shortcut to toggle = F12)
[ext] Customizable backgrounds and textures
Support for GNU Go over GTP
Runs on Windows, Mac and Linux
Loads and saves SGF files
Loads UGF files and the PandaNet mail magazine games
Loads Ishi files
Loads games in the Jago XML file format
SGF game editing
Two different game tree displays
A player database tool implemented as Python plugin
A standalone manager for the player and games database
A converter for UGF to SGF format
A converter for Ishi to SGF format
glGo is written in C++ and Python and based on wxWidgets, OpenGL and SDL.
History
PANDA-glGo was formerly known as glGo, an open source software. For those that are still interested, the some of the sources for the open source version of glGo are still available at Sourceforge.