Apache is a free and open-source cross-platform web server software.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Plausible is an open-source alternative to Google Analytics.
ProcessWire is an open source content management system (CMS) and framework (CMF).
Varnish is a reverse caching proxy.
Vimeo is a video hosting, sharing and services platform. Vimeo operation an ad-free basis by providing subscription plans.