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.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Sendinblue is an email marketing solution for small and medium-sized businesses that want to send and automate email marketing campaigns.
Sentry is an open-source platform for workflow productivity, aggregating errors from across the stack in real time.
Squarespace Commerce is an ecommerce platform designed to facilitate the creation of websites and online stores, with domain registration and web hosting included.
Squarespace provides Software-as-a-Service (SaaS) for website building and hosting, and allows users to use pre-built website templates.
A modest JavaScript framework for the HTML you already have.