duraconf - Collection of hardened configuration files for SSL/TLS services.
Lemur - Manages TLS certificate creation.
Step Certificates - Online certificate authority and related tools for secure automated certificate management, so you can use TLS everywhere.
autocertdelegate - Get LetsEncrypt TLS certs for internal-only TLS servers via a delegated golang.org/x/crypto/acme/autocert server.
SwiftTLS - TLS implementation in Swift.
SSLproxy - Transparent SSL/TLS proxy for decrypting and diverting network traffic to other programs, such as UTM services, for deep SSL inspection.
libtls-bearssl - Implementation of libtls on top of BearSSL.
IDontSpeakSSL - Simple tool based on sslyze to scan large scope and provide SSL/TLS vulnerabilities.