^{(Unknown author - Creative Commons Zero, Public Domain Dedication)}

^{(Øyvind Holmstad - Creative Commons Attribution-Share Alike 4.0)}

^{(ParentingPatch - Creative Commons Attribution-Share Alike 3.0)}

^{(Florian Hurlbrink- Creative Commons Attribution-Share Alike 4.0)}

^{(Ancula (Robert Belingar) - Creative Commons Attribution-Share Alike 3.0)}

^{(Tim Simms - Creative Commons Attribution-Share Alike 3.0)}