Mobidonia - Native mobile app builder for iOS, Android & Apple Watch

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

AppSheet - AppSheet enables users to create mobile apps instantly for both OS and Android. 

Solo - Personal kanban boards hosted on your own server

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!

Cash App - The easy way to send, spend, bank, and invest.