Apache is a free and open-source cross-platform web server software.
Mixpanel provides a business analytics service. It tracks user interactions with web and mobile applications and provides tools for targeted communication with them. Its toolset contains in-app A/B tests and user survey forms.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Typekit is an online service which offers a subscription library of fonts.
Unix is a family of multitasking, multiuser computer operating systems.