https://brightyard.co is a comprehensive application that includes a web server, APIs, role management, admin dashboard, and Windows and macOS desktop apps — all built in Wappler.
There's also MealPro
Nearly anything is possible with Wappler, it's extremely open-ended with what you can build, that does have a little downside in that it doesn't come out of the box with User Management and other modules, you need to develop them yourself, but that flexibility is where Wappler shines, especially in the long-term.