The Crypto++ library implements cryptographic algorithms and schemes. The algorithms and schemes are specified by a number of governments, organizations and standards. Sometimes, there is no published standard other than a paper.
Cryptography Research and Evaluation Committees are Japanese government cryptographic standards.
New European Schemes for Signatures, Integrity and Encryption was a European research project used to identify secure cryptographic primitives.
National Institute of Standards and Technology publishes standards.
P1363 is an IEEE standard for public-key cryptography. It includes specifications for public-key cryptography, Lattice-based cryptography, Password-based cryptography, and Identity-based cryptography using pairings.
Internet Engineering Task Force (IETF) publishes Request for Comments (RFC).
SM2 is a four-part standard for public key algorithms specified by China.