Ruby is an open-source object-oriented programming language.

Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

RackCache is a quick drop-in component to enable HTTP caching for Rack-based applications.

Apache is a free and open-source cross-platform web server 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.

CentOS is a Linux distribution that provides a free, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).

PHP is a general-purpose scripting language used for web development.

Google Cloud is a suite of cloud computing services.

Cloudflare bot management solution identifies and mitigates automated traffic to protect websites from bad bots.

Cloud CDN uses Google's global edge network to serve content closer to users.

OneSignal is a customer engagement messaging solution.