Leibniz

at the Rice Gallileo project	at St. Andrews
The Monadology (44kb HTML)
A classic of rationalist metaphysics.
The Method of Mathematics (26kb HTML)
A curious combination of rhetoric promoting Leibniz's ideas for a Lingua Characteristica (or Universal Characteristic, or simply, a universal language) and a Calculus Ratiocinator and autobiographical reminiscences
Louis Couturat's "The Logic of Leibniz" (partly translated by Donald Rutherford and R. Timothy Monroe)
Characteristica Universalis and the Origin of the Symbolator (by Dr. Andreas Goppold at the University of Ulm)