flyceipts - A fresh look at digital receipts & other documents.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value
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.
Ramp Receipts - Create a receipts/invoice dashboard for Stripe
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.