Copyright held by the owner/author(s). CHI’18 Extended Abstracts, April 21–26, 2018, Montreal, QC, Canada ACM 978-1-4503-5621-3/18/04. https://doi.org/10.1145/3170427.3188563 Abstract We present Codestrate Packages, a package-based system to create extensible software within Codestrates. Codestrate Packages turns content creation from an applicationcentric model into a document-centric model. C...