[GiNaC-list] Exterior algebra tools?

After finding Maple inflexible and temperamental, I am interested in using GiNaC for some computations in exterior differential systems. I've read through the documentation fairly carefully, but I haven't seen any routines for working with exterior differential forms so far. Has anyone written a library to deal with alternating forms, including things like wedge-products, exterior differentiation, Lie derivatives (via Cartan's formula), and left-hook (inner product with vectors)? Thanks, Abe Smith (Duke University)