Gpg4win (GNU Privacy Guard for Windows) is encryption software for files and emails. Gpg4win supports both relevant cryptography standards, OpenPGP and S/MIME (X.509), and is the official GnuPG distribution for Windows. It is maintained by the developers of GnuPG. 

Gpg4win - GnuPG for Windows

XML Security Library provides support for XML Digital Signature and XML Encryption. It is based on LibXML/LibXSLT and can use practicaly any crypto library (currently there is "out of the box" support for OpenSSL, GnuTLS and NSS). 

XML Security Library is a C library based on LibXML2.

XML Security Library

cryptlib is a powerful security toolkit that allows even inexperienced crypto programmers to easily add encryption and authentication services to their software. It provides support for S/MIME and PGP/OpenPGP secure enveloping, SSL/TLS and SSH secure sessions, CA services such as CMP, SCEP, RTCS, and OCSP, and other security operations such as secure timestamping. 
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cryptlib provides an extensive range of other capabilities including full X.509/PKIX certificate handling (all X.509 versions from X.509v1 to X.509v3) with additional support for SET, Microsoft AuthentiCode, Identrus, SigG, S/MIME, SSL, and Qualified certificates, PKCS #7 certificate chains, handling of certification requests and CRLs including automated checking of certificates against CRLs and online checking using RTCS and OCSP, and issuing and revoking certificates using CMP and SCEP. In addition cryptlib implements a full range of certification authority (CA) functions, as well as providing complete CMP, SCEP, RTCS, and OCSP server implementations to handle online certificate enrolment/issue/revocation and certificate status checking. Alongside the certificate handling, cryptlib provides a sophisticated key storage interface that allows the use of a wide range of key database types ranging from PKCS #11 devices, PKCS #15 key files, and PGP/OpenPGP key rings through to commercial-grade RDBMS' and LDAP directories with optional SSL protection.

cryptlib is a powerful security toolkit that allows even inexperienced crypto programmers to easily add encryption and authentication services to their software. It provides support for S/MIME and PGP/OpenPGP secure enveloping, SSL/TLS and SSH secure sessions, CA services such as CMP, SCEP, RTCS, and OCSP, and other security operations such as secure timestamping. 

Cryptlib - provides Encryption and Authentication Service

Sodium is a new, easy-to-use software library for encryption, decryption, signatures, password hashing and more. It is a portable, cross-compilable, installable, packageable fork of NaCl, with a compatible API, and an extended API to improve usability even further. Its goal is to provide all of the core operations needed to build higher-level cryptographic tools.

libsodium -  A modern and easy-to-use crypto library.

The OpenCA PKI Development Project is a collaborative effort to develop a robust, full-featured and Open Source out-of-the-box Certification Authority implementing the most used protocols with full-strength cryptography world-wide.  The project development is divided in two main tasks: studying and refining the security scheme that guarantees the best model to be used in a CA and developing software to easily setup and manage a Certification Authority. 

OpenCA - PKI Management Software

OpenSC provides a set of libraries and utilities to work with smart cards. Its main focus is on cards that support cryptographic operations and facilitate their use in security applications such as authentication, mail encryption and digital signatures. OpenSC implements the PKCS11 API so applications supporting this API (such as Mozilla Firefox and Thunderbird) can use it. On the card OpenSC implements the PKCS15 standard and aims to be compatible with every software/card that supports it.

OpenSC - Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend

Charm is a framework for rapidly prototyping advanced cryptosystems.  Based on the Python language, it was designed from the ground up to minimize development time and code complexity while promoting the reuse of components. It supports Base crypto library, including symmetric encryption schemes, hash functions, PRNGs, digital signature, encryption and lot more.

Charm-crypto - A Python-based rapid prototyping framework for cryptosystems

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Gpg4win - GnuPG for Windows

XML Security Library

Cryptlib - provides Encryption and Authentication Service

libsodium - A modern and easy-to-use crypto library.

OpenCA - PKI Management Software

OpenSC - Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend

Charm-crypto - A Python-based rapid prototyping framework for cryptosystems

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Gpg4win - GnuPG for Windows

XML Security Library

Cryptlib - provides Encryption and Authentication Service

libsodium - A modern and easy-to-use crypto library.

OpenCA - PKI Management Software

OpenSC - Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend

Charm-crypto - A Python-based rapid prototyping framework for cryptosystems

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