The best open source alternative to OpenSSL is LibreSSL. If that doesn't suit you, our users have ranked more than 10 alternatives to OpenSSL and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to OpenSSL are mbed TLS, GnuTLS, Network Security Services and wolfSSL.
LibreSSL is a version of the TLS/crypto stack forked from OpenSSL in 2014, with goals of modernizing the codebase, improving security, and applying best practice development processes.
LibreSSL is the most popular Windows, Mac & Linux alternative to OpenSSL.
LibreSSL is the most popular Open Source & free alternative to OpenSSL.
Mbed TLS (formerly known as PolarSSL) makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.
mbed TLS is the most popular Android alternative to OpenSSL.
GnuTLS (the GNU Transport Layer Security Library) is a free software implementation of the SSL, TLS and DTLS protocols. It offers an application programming interface (API) for applications to enable secure communication over their network transport layer, as well as interfaces...
Network Security Services (NSS) comprises a set of libraries designed to support cross-platform development of security-enabled client and server applications with an option support for hardware SSL acceleration on the server side and hardware smart cards on the client side.
wolfSSL (formerly CyaSSL) is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud. http://www.wolfssl.com.
wolfSSL is the most popular iPhone, iPad & Android Tablet alternative to OpenSSL.
Themis is a cryptolibrary, providing high-quality security services for secure messaging and encrypted storage. Themis is aimed at modern development practices, with wrappers for Ruby, Python, PHP, Java / Android and iOS / OSX.
Using certificates from real certificate authorities (CAs) for development can be dangerous or impossible (for hosts like example.test, localhost or 127.0.0.1), but self-signed certificates cause trust errors.
Ciphey aims to be a tool to automate a lot of decryptions & decoding's such as multiple base encodings, classical ciphers, hashes or more advanced cryptography. Automatically decrypt encryptions without knowing the key or cipher, decode encodings, and crack...
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Cleaned up. Removed crap like SSL, SHA-0 and many other things.