Apache is a free and open-source cross-platform web server software.
Campaign Monitor is a global technology company that provides an email marketing platform.
Google Analytics is a free web analytics service that tracks and reports website traffic.
ProcessWire is an open source content management system (CMS) and framework (CMF).
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
UIKit is the framework used for developing iOS applications.