Microsoft PowerApps is an easy-to-use but simplistic builder for web apps that can also run on mobile clients for iOS and Android. PowerApps Studio for Windows is the design tool; account and app management happen in a web interface. You can start with a sample app or allow PowerApps to automatically generate an app from your data source using heuristics based on the data fields. Then you can customize your app design and publish your app.
Data sources include Excel files stored on OneDrive for Business, Dropbox, or Google Drive, SharePoint Online lists, Salesforce objects, Microsoft Dynamics CRM Online records, Azure SQL Database tables, Office 365 Exchange data, Twitter, Microsoft Translator, and your custom Swagger APIs. You can also add formulas to your app. You can only share apps within your domain.
Read my full review, “PowerApps first look: Create mobile apps without coding.”
PowerApps, Microsoft, currently in Preview, free and paid service levels planned.