Amazon S3 or Amazon Simple Storage Service is a service offered by Amazon Web Services (AWS) that provides object storage through a web service interface.
Amplitude is a web and mobile analytics solution with cross-platform user journey tracking, user behavior analysis and segmentation capabilities.
cdnjs is a free distributed JS library delivery service.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Screenshots with JavaScript.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.