Our Unitarian Heritage
Online text of Earl Morse Wilbur's 1925 history of the Unitarian movement.

Professor Brought Christmas Tree to New England
From the Harvard Gazette, an article on Unitarian minister and abolitionist Charles Follen, and the story of how he promoted the Christmas tree.

Reflections of Public Ministry at Harvard Divinity School
An online exhibit.

Socinianism
Catholic Encyclopedia article on this body of doctrine held by one of the Antitrinitarian sects that gave rise to Unitarianism.

The English General Baptists: A Historical Site
English General Baptists are now, for all intents and purposes, a part of the Unitarian movement. This site illustrates the adoption by the General Baptists the doctrines of unitarianism and universalism (though this convergence has nothing to do with a similar convergence in the United States) in the first quarter of the nineteenth century.

Unitarian Universalist Historical Society
Links for Unitarian Universalist history.

Unitarian Universalist Origins
History of the Unitarian Universalist religion.

Unitarian Universalists in Science Fiction
Annotated list of science fiction novels and stories with UU characters or references. Also, UU authors of science fiction.

Universalism on the Pacific Coast
Articles include history of individual churches, including ones that no longer exist.