For academics all over the world, Academia.edu is a place "to share their research, monitor deep analytics around the impact of their research, and track the research of academics they follow." Currently, over one million academics have signed up, and there are over 1.2 million papers available online here. It is completely free to sign up, and registered members can share their own professional work, follow other academics, and also look up analytical statistics on various works in the database. This site is compatible with all operating systems.