The Open Educational Resources (OER) movement has been growing rapidly, opening up new opportunities for widening participation. One of the Open Content Initiatives is the OpenLearn project, launched by the Open University, which integrates three knowledge media technologies: Compendium, Flashmeeting and MSG. Our current work is to investigate how these social software tools can be used to foster open sensemaking communities and promote the collective building of knowledge, by mapping knowledge, location and virtual interactions. Compendium (knowledge mapping software) Compendium is a software tool for visual thinking, used to connect ideas, concepts, arguments, websites and documents. Compendium (http://www.compendiuminstitute.org) was initially developed at Verizon in the USA and then in 2002 the Open University in the UK took over writing the software. The purpose of the Compendium application is to manage business information, model problems, and map argumentation discussions. It can be used as an individual or group tool to develop new ideas, goals, logical concepts and collaborative scenarios. Fig 1. Compendium used to collect disparate resources.