Google Analytics is a free web analytics service that tracks and reports website traffic.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
Paddle is a billing and payment gateway for B2B SaaS companies.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.