Eberhard Nestle's (1904, 1913): H Kainη ∆iaθηkη (Greek New Testament); Text with Critical Apparatus was published by British and Foreign Bible Society, but it is now in the public domain. The digital
version (https://sites.google.com/site/nestle1904/) was edited by
Diego Renato dos Santos and is in the public domain.
The Finnish Analytical Bible Concordance Project (1991-1997) extended the digitised Nestle 1904 with additional verses that had been translated from a complementary source edition in 1938. The added verses are in the public domain.
The GNT in the HELFI corpus is a proper extension of Nestle's 1904
GNT. The extended GNT is in the public domain.
The lemmas and morphological data of the Nestle 1904 edition have been created by Professor Maurice A. Robinson at Southeastern Baptist
Theological Seminary, North Carolina, and Dr. Ulrik Sandborg-Petersen
at the Emergence Consult and the Aalborg University, Denmark.
(https://github.com/biblicalhumanities/Nestle1904).
The Greek lemmas and morphology in the HELFI corpus are in the
public doman.