I created a restaurant app for my client with zapable. it just took 30 minutes to get it live and I earned $459 from the client. it's really great learning.
King of App - King of App is an open-source mobile app builder.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Stackify Retrace - Stackify Retrace is an application performance management platform for .NET and Java developers.
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.
Recast.AI - Recast.AI is the leading platform to build, connect and monitor bots.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.