The American Theological Library Association has compiled a series of freely available resources for students studying in the fields of religion and theology. You can access their list of resources here.
Abilene Christian University has complied and digitized Restoration Movement resources that "feature historical texts, pictures, resources for historical research and links to other relevant pages dealing with the Restoration Movement. This nineteenth-century unity and restitution effort by Barton W. Stone and Thomas and Alexander Campbell spawned several distinct religious groups: the Churches of Christ, the Christian Churches, and the Disciples of Christ. The wider historical context also includes the Christian Churches of James O'Kelly and the Christian Connexion of Elias Smith and Abner Jones. The Restoration Movement pages seek to accommodate the historical heritage of all of these religious traditions."