Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
OpenSSL - OpenSSL is a free and open source software cryptography library that implements both the Secure Sockets Layer (SSL) and the Transport Layer Security (TLS) protocols, which are primarily used to provide secure communications between web browsers and …
nginx - A high performance free open source web server powering busiest sites on the Internet.
Let's Encrypt - Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
vCenter Server - IaaS platform for managing and deploying virtual machines
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.