Apache is a free and open-source cross-platform web server software.
Bandsintown Events Widget is a free widget which makes it simple to embed your event listings and allow fans to buy tickets, RSVP, follow you and join your Email & SMS lists.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Varnish is a reverse caching proxy.
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.
WP Fastest Cache is one of a number of plugins for WordPress designed to accelerate the performance of your website.
Yoast SEO is a search engine optimisation plugin for WordPress and other platforms.