The Works of P T Forsyth
Scottish Theologian P.T. Forsyth (1848-1921) is considered by many to be one of the greatest English-speaking theologians of the early Twentieth Century (see Wikipedia). In order to make his works more accessible I am in the process of creating a complete bibliography here and so far 18 of his books are available on this page for free download.
Although Forsyth never wrote a systematic theology himself, John D. Rodgers has compiled one and this is also available here by kind permission of the United Reformed Church.