Great Voyages: Gassendi: Sketch of his thought, biographical timeline, and portrait.
Pierre Gassendi: Short biography with bibliography and links, from the MacTutor History of Mathematics.
Pierre Gassendi: Article by J.G. Hagen, from the Catholic Encyclopedia. Covers Gassendi's life and work in some detail.
Probabilist Deductive Inference in Gassendi's Logic: Scholarly paper by Saul Fisher.