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PGP
PGP are tools for secure datas mainly e-mail communication. Basic version free....
Sub::Signatures
Sub::Signatures module can use proper signatures for subroutines, including dispatching....
Perl module subroutines dispatching signatures subroutines signatures
Method::Signatures
Method declarations with signatures and no source filter...
Perl module perl method method declarations method signatures
PGP::Sign
Create detached PGP signatures for data, securely...
pgp-mime
Tools for dealing with Pretty Good Privacy (PGP) and email...
Parse::Method::Signatures
Perl6 like method signature parser...
Blank Canvas Gmail Signatures
Insert multiple HTML signatures into your Gmail emails....