--- title: For developers order: 1120 --- Welcome to the FreeSewing documentation for developers. Our core library is a toolbox for parametric sewing pattern design. Here's some of the most relevant reference documentation: - [Core API reference](/reference/api/) - [Pattern configuration file](/reference/config/) - [Settings](/reference/settings/) We have a [Pattern design tutorial](/tutorials/pattern-design/) that is a good way to familiarize yourself with the FreeSewing platform. Alternatively, we have bite-sized guides that cover [prerequisites](/guides/prerequisites/), [patterns](/guides/patterns/), [best practices when designing](/guides/best-practices/), and [plugins](/guides/plugins/). #### Not here for core? If you are interested the FreeSewing project as a whole, the following links cover different aspects of our setup: