Engaging students in free and open source software (FOSS) projects is educationally rewarding but is challenging for students and faculty. We aim to ease student engagement in, and faculty use of, FOSS by developing HFOSS (Humanitarian FOSS) Kits. An HFOSS kit is a snapshot of an HFOSS project at a particular point in time, packaged with student learning activities, an instructor guide, and a containerized development environment (if necessary). Using HFOSS kits in the classroom has several advantages. While active projects change and evolve over time, an HFOSS Kit enables a stable, reusable educational experience. Student learning activities and instructor guides are written against the stable project snapshot thus the high cost of developing and revising activities and guides can be amortized as they are reused across multiple semesters. Students are engaged in a more authentic learning experience as they develop their FOSS skills and concepts using using actual projects, rather than typical, single-semester examples. The containerized development environment facilitates immediate context-sensitive feedback as students complete assignments. The instructor or the environment can simulate community interaction. In our demonstration, we will expand upon the details of an Kit and the reasons for using one. We will demonstrate GitKit - a kit for teaching Git and Git workflow, what it provides, and how it can be used in the classroom. We will also explain the technical architecture for the Kits, the tools we have developed to capture the snapshot of project artifacts and support Kit building, and our future development plans.