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
Characteristica Universalis and the Origin of the Symbolator (by Dr. Andreas Goppold at the University of Ulm)