Dev Quiz is a simple Quiz app with Flutter built in the last Rocketseat Next Level week
AppFlowy is an open-source alternative to Notion. You are in charge of your data and customizations. Built with Flutter and Rust.
This flutter app is based on the design made Dmytro Prudnikov for Yalantis on Dribble.He describes the design as:
Mixpanel is a product analytics tool that enables you to capture data on how users interact with your digital product. Mixpanel then lets you analyze this product data with simple, interactive reports that let you query and visualize the data with just a few clicks.