GooseMPL provides a style and several style extensions for matplotlib, some custom functions that extend matplotlib, and several examples to make professional plot using matplotlib.
This library is free to use under the MIT license. Any additions are very much appreciated, in terms of suggested functionality, code, documentation, testimonials, word of mouth advertisement, .... Bug reports or feature requests can be filed on GitHub. As always, the code comes with no guarantee. None of the developers can be held responsible for possible mistakes.