SkyNET is a Home & Education software developed by sky-net. After our trial and test, the software is proved to be official, secure and free. Here is the official description for SkyNET:
SkyNET is a Sky Chart program for .NET. It works under Mono using the Gtk# Library, and more limited Qt# and #WT frontends are provided Now. If you are looking for a free good mature astronomical program for Linux try the excelent KStars.
SkyNET is free software, distributed under the GNU LGPL.