RESTClient - RESTClient can be used to test variety of HTTP communications and RESTful webservices.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
soapUI - SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.
Supabase - An open source Firebase alternative
WiX - Create a free website with Wix.com. Customize with Wix' website builder, no coding skills needed. Choose a design, begin customizing and be online today
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA