ST

stunnel

stunnel is an open-source multi-platform application designed to add TLS encryption functionality to existing clients and servers without changes in their code. It uses the OpenSSL library to provide secure encrypted connections for clients or servers that do not natively support TLS or SSL. Developed and maintained by Michał Trojnara.
Latest: 5.78
Last checked: Feb 26, 2026 10:54am
Rank: 4507/15140
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Overview

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License: GNU General Public License (GPL) with OpenSSL exceptionWinget: Available
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Version & Lifecycle

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Current: 5.78 N-2: 5.76 Avg cadence: Every 122 days

Tags

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TLS SSL encryption proxy OpenSSL secure tunneling network security open-source

Top Contributors

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  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

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Stunnel

Notes

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stunnel supports FIPS 140-2 mode if compiled with appropriate OpenSSL provider. It is free software but not a community project; commercial support is available from the author.

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