The German Lovecraft Society is now able to provide Germans with the full FHTAGN as a book, this being…

a pen & paper set of [RPG] rules under an Open Game License, with which commercial and non-commercial projects can be implemented by third parties without the need for a separate license or consent. The volume is 172 pages and contains all the rules that Game Masters and players need for exciting hours in the cosmic horror universe of H.P. Lovecraft.

Apparently based on Delta Green.