Flask's large ecosystem of extensions make it easier for developers to build common web app features such as authentication, database operations and APIs even though support is not built into the core Flask web framework. This design is by choice in contrast to Django's "batteries-included" approach. Either framework's design decision is a viable approach depending on the needs and requirements of the application you are building.
The extensive collection of Flask libraries is a great source for learning the framework through reading code examples.
This alphabetically-ordered list of projects provide helpful example code for building your own web apps.
flask-base's code is open sourced under the MIT license.
FlaskBB is provided as open source under this license.
FlaskBB's code examples can be found on:
Code examples from Flasky are shown on the following pages: