Retro Virtual Machine - The ZX Spectrum and Amstrad CPC emulator which works natively in macOS, Linux, and Windows.
Bizness Apps - Create your own app or become a reseller and build apps for others
JSSpeccy - ZX Spectrum emulator in JavaScript
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
Speccy emulator - Sinclair ZX Spectrum emulator