The Visokio website uses images from various sources, including:
Visokio also redistributes various icon sets and software libraries bundled inside the Omniscope application installer download.
For a comprehensive list of 3rd party software used in Omniscope, see 3rd party licenses [3] .
Links:
[1] http://commons.wikimedia.org/wiki/Tango_icons
[2] http://creativecommons.org/licenses/by-sa/2.5/
[3] http://kb.visokio.com/kb/3rdpartylicenses