Project announced in April that provides for online marking of PDFs for Moodle19 returning the marked item to the assignment activity. Uses Ghostscript to generate PDFs and Javascript in the client to markup the PDFs
This is the main Moodle developers documentation wiki, covers development environment and process, introduces core libraries and includes howtos for getting started with moodle development
An intro to Roles and capabilities in Moodle with links off to more detail. These need to be considered and honored when building an interface to the Moodle system