OwlVision is a free software project aimed at developing a GDSII viewer.
Editor: OwlVision is a free software project aimed at developing a GDSII Viewer by using Java programming language. Virtually, the program can be run on all of the platforms, including MS Windows, MacOS, UNIX, GNU/Linux, etc.

Features:
-View GDSII/GDS2 stream format
(zoom in/out, toggle specific layers/cells, choose colors, view cell hierarchy)
-All-angle geometry
-Translate GDSII into ASCII
-Translate ASCII into GDSII
-Save layouts as GIF/JPG files
-No need to install/uninstall
-Platform Independent
-GNU General Public License you can free download OwlVision GDSII Viewer 1.1.2 now.