License
Theos (and by extension, Logos) is available under the provisions of the GNU General Public License, version 3 (or later), available here.
Projects created using Theos and/or Logos are not considered derivative works (from a licensing standpoint, or, for that matter, any other standpoint) and are, as such, not required to be licensed under the GNU GPL.
The included project templates are license-free. The use of a template does not confer a license to your project.