wolfSSL/wolfssl
The wolfSSL library is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud. wolfSSL supports up to TLS 1.3 and DTLS 1.3! Update to wolfSSL 5.9.1 for the latest CVE fixes.
License & maintenance
GPL-3.0 is a copyleft license: products that include or modify it may have to publish their code.
Last code push today.