Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Sailthru is a marketing automation software and multi-channel personalisation tool that serves ecommerce and media brands.
Unpkg is a content delivery network for everything on npm.