Unfragile

The request names openssl, so the OpenSSL Library comes first: a general-purpose cryptography and secure communication toolkit, Apache-licensed from version 3.0 and downloadable from its GitHub repository 1. Alternatives that offer the same TLS and crypto functionality are LibreSSL, a fork of OpenSSL 6, and stunnel, which uses the OpenSSL library to add TLS to existing clients and servers 5.

1
OpenSSL Libraryopenssl-library.orgwebsite read, tools not yet checked
A commercial-grade, full-featured toolkit for general-purpose cryptography and secure communication, released under the Apache License from version 3.0 and available from its GitHub repository 1.
Website Docs
2
LibreSSLlibressl.orgwebsite read, tools not yet checked
A TLS and crypto stack forked from OpenSSL in 2014, with a focus on modernizing the codebase and improving security, currently at release 4.4.0 6.
Website
3
stunnelstunnel.orgwebsite read, tools not yet checked
A GNU/GPL-licensed proxy that adds SSL/TLS encryption to existing TCP clients and servers without code changes, using the OpenSSL library for cryptography 5.
Website Docs

Sources

1OpenSSL Libraryopenssl-library.org · read 2026-10-29
5stunnel: Homestunnel.org · read 2026-10-29
6LibreSSLlibressl.org · read 2026-10-29

For agents: the 10 actions behind this answer

· OpenSSL Library website read, tools not yet checked
github/ossar-action · ossar-action verified and signed
Run open source security static analysis tools without the added complexity with OSSAR (Open Source Static Analysis Runner)
KeyManagementService · AWSSDK - KeyManagementService verified and signed
radar-get-email-security-summary-by-tls-version · Cloudflare API verified and signed
Get email TLS version summary
· stunnel: Home website read, tools not yet checked
Home page for stunnel: a multiplatform GNU/GPL-licensed proxy encrypting arbitrary TCP connections with SSL/TLS.
· LibreSSL website read, tools not yet checked
the main LibreSSL page
literature · firecrawl-py verified and signed
· async-std website read, tools not yet checked
A Rust library for easy and understandable async programming
cython · yarl verified and signed
· Cryptography 51.0.0-dev1 documentation website read, tools not yet checked

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