List of sites we may want to add at some point. - [ ] `SpinSite` with Z2 x Z2 symmetry - [ ] `SpinfulBosonSite` - [ ] `SpinfulFermionSite` with spins larger than 1/2 - [ ] `SpinHalfHoleSite` - [ ] More anyon sites? List of couplings - [ ] (nothing yet)