affi
affi is an affine indexing package that provides convenience functions for traversing slices of arrays, optionally with index permutations and other convenient transformations. A driver clause for iterate is provided, along with map-subarray, a simple yet powerful function for mapping arrays into each other using affine indexes. The package includes a tutorial. It could be construed as supporting linear algebra.

The package is asdf-installable. The link to the git repository is available from my homepage.

ASDF-install package (obsolete) http://www.princeton.edu/~tpapp/software/affi.tar.gz