Apps similar to Themis include OpenSSL, which is free and open source. Other options are GnuTLS, SecureBlackbox® and Network Security Services. In total there are four Cryptography Libraries like Themis for Windows, Linux, Mac, Android and iPhone.
OpenSSL is a framework which implements the secure socket layer. It ships with a program/library which gives you access to all those functions.
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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...
Software components for Data Protection, Secure Storage, and Secure Transfer. Trusted in high security, mission-critical applications for decades.
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.
