Apache is a free and open-source cross-platform web server software.
Debian is a Linux software which is a free open-source software.
OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.
Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.
Siteimprove is a digital analytics and content QA platform.