[asd2r23dasd]

I agree that OpenSSL is likely the most robust library out there, and if you're talking about provisioning your web server / doing some https from a high-level language then it's definitely the sane choice. (fwiw, I had some work looking at a BouncyCastle TLS server and...eek)

The one counter-example is the embedded space, particularly where code addition/modification for hardware integration is required. Here OpenSSL's footprint and APIs are a tad unwieldy compared to some alternatives.

Basically I just wanted to give mbedTLS a shout-out as, IMO, the clear winner in that particular space.

[MrBuddyCasino]

Also notable in embedded: bearSSL (free) and wolfSSL (commercial)

[sanxiyn]

Note that wolfSSL is also open source (GPLv2) and you don't need commercial license to use wolfSSL.