Stereonet is a huge release with a completely new and robust internal data structure and an openGL 3D view of the lower hemisphere for teaching purposes. It includes almost all of the goodness of Stereonet 10 and lots of subtle new tweaks as well (check out the detailed version history, below). This version of Stereonet is compatible with all modern operating systems and has a modern user interface which has been modeled after OSXStereonet for Mac by Nestor Cardozo and me. It can read and write older Stereonet text files, can read the Stereonet 11 binary files, but saves its data in a new binary format.