This page of links to some of Calvin's shorter writings completes our coverage of the Reformer's works (in English) which are available for downloading.
Corresponding to his four volumes of Letters are three volumes of tracts, often titled Tracts Relating to the Reformation. Like some other material we have looked at, these volumes were published by the Calvin Translation Socieity.
Volume 1 includes an account of Calvin's life by his successor in Geneva, Theodore Beza; and The Necessity of Reforming the Church.
Volume 2 includes some treatises on the sacraments, and the Catechism of the Church in Geneva.
Volume 3 includes An Antidote to the Council of Trent, and the True Method of Reforming the Church.
Last, but not least, is a volume entitled Calvin on Secret Providence which takes the form of a series of challenges which Calvin then answers.