Frescobaldi has (Actually: will have, currently this is on an unmerged and unreleased branch of the repository) an API for using extensions that can significantly enhance the functionality. This can be used for adding functionality (one could think of text editing tools for special use cases (e.g. calculations for serial or algorithmic composition), a statistics module, a chat client integrated in the notation IDE, or a notation Pong) that seems too specific to be integrated in the core application. Another use case is providing project management tools to handle a specific larger project or recurring “house” tasks.

The Wiki pages of this Sample Extension serve - along with the code of the extension - as the introductory tutorial for writing Extensions.