Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
GoodBarber - GoodBarber is a mobile app creation platform.
Angular.io - Angular is a JavaScript web framework for creating single-page web applications. The code is free to use and available as open source. It is further maintained and heavily used by Google and by lots of other developers around the world.
Dropsource - Mobile development platform for building native iOS & Android apps
HTML5 - 5th major revision of the core language of the World Wide Web
Bizness Apps - Create your own app or become a reseller and build apps for others