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Stunnel is a proxy designed to add TLS encryption functionality to existing
clients and servers without any changes in the programs' code. Its architecture
is optimized for security, portability, and scalability (including
load-balancing), making it suitable for large deployments.

Stunnel uses the OpenSSL library for cryptography, so it supports whatever
cryptographic algorithms are compiled into the library. It can benefit from the
FIPS 140-2 validation of the OpenSSL FIPS Provider, as long as the building
process meets the OpenSSL FIPS 140-2 Security Policy. Our latest Windows
installer includes the OpenSSL FIPS Provider.

Stunnel is a free software authored by Michał Trojnara. Although distributed
under GNU GPL version 2 or later with OpenSSL exception, stunnel is not a
community project. We retain the copyright of the source code. Please contact us
for commercial support or non-GPL licenses. Free, community-based support is
also available via stunnel-users mailing list.

We offer commercial support with several levels of response time up to 24/7/365
helpline.

Support

Download latest version of stunnel and try it out yourself.

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