The Livre d'orgue de Limoges (or Manusicript de Limoges) is a collection that contains organ works, mainly written between 1710 and 1725. Many pieces in this collection are anonymous or from composers like André Raison, Gilles Jullien and Gaspard Corrette.
Source: Wikipedia
It is a rich source of various pieces. Pierre Gouin made a beautiful edition of it, freely available on IMSLP. The first two pieces of this edition are called 'Prélude Cromatique' and 'Fugue Cromatique', so that gives a nice Prélude & Fugue.