This document summarizes the Open Graphical Learning Modeler (OpenGLM) tool, which allows for standards-based sharing of instructional models within communities. OpenGLM builds upon existing modeling tools by integrating a sharing space called the Open ICOPER Content Space, which allows users to search, retrieve, annotate, enrich, and share instructional models. The document describes how OpenGLM streamlines the reuse and adaptation of instructional models for new courses. An evaluation with university users found benefits like reuse of materials and shared resources, though limitations around IT literacy, motivation, and intellectual property were also noted.