It is currently alpha and doesn't support events. Graphics and colormaps seems to work ok. I have tested this on a SparcStation 10 with Solaris 2.5.1 and ggi-0.0.9.
Please mail me if you have any problems or suggestions.
Download the source-files:
Precompiled so-file:
You will have to add something like this in your /etc/libggi.conf:
display-sun display/dll/sun.so