Pusher Beams - Send push notifications programmatically at scale
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Magnify - Push out beautiful website announcements in 10 seconds.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
PushOwl - Re-engage website visitors with push notifications
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.