Modeling is a core topic in Software Engineering Education. Nevertheless, students face difficulties while learning software modeling. One possible cause is the traditional teacher-centered approach that still dominates in Computer Science. To teach software modeling effectively in computing courses, instructors who usually employed traditional methods could use active learning strategies. However, instructors are reluctant to change their teaching approaches due to several barriers that hinder the application of active learning strategies. Besides, relatively little research addresses how to mitigate them. The objective of the research presented in this paper is to help instructors implementing active learning strategies when teaching software modeling. To achieve this objective, we conducted a Design Science Research (DSR). We proposed an artifact called OpenSMALS, an Open Repository for Software Modeling Teaching using Active Learning Strategies. OpenSMALS provides specific guidelines on how instructors can apply these strategies and helping instructors to identify the active learning strategies best suit their teaching context. We performed three DSR design cycles—in four different universities—to evaluate the use of OpenSMALS. Our results show that OpenSMALS satisfactorily reduced the barriers faced by instructors, and it achieved an appropriate maturity level to be adopted by other instructors.