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Iterative methods
Flexible GMRES, though this is not the focus of the package
Block SSOR and ILU, possibly with block fill-in, and with various methods for explicit and implicit approximation of inverses of pivot blocks
Data structures
Internal, as a C++ class.
Access operations on the data structure
Retrieve rows and scalar information such as the number of nonzeros of the matrix.
Operations using the data structure
Multiply and multiply transpose by the matrix; solve and solve transpose of the preconditioner, both the whole preconditioner, and the left and right split parts.

Reference manual, 53 pages
Example codes
Yes, in Fortran, C, and C++

Victor Eijkhout
Mon Aug 25 17:46:10 PDT 1997