[2] It has no database abstraction layer, form validation, or any other components where pre-existing third-party libraries provide common functions.

Extensions exist for object-relational mappers, form validation, upload handling, various open authentication technologies and several common framework related tools.

[7] When Ronacher and Georg Brandl created a bulletin board system written in Python in 2004, the Pocoo projects Werkzeug and Jinja were developed.

[10] In April 2016, the Pocoo team was disbanded and development of Flask and related libraries passed to the newly formed Pallets project.

Werkzeug (German for "tool") is a utility library for the Python programming language for Web Server Gateway Interface (WSGI) applications.