University of Florida Sparse Matrix Collection:

Sources of some matrices and related links

Many of the matrices in the collection come from original sources - computational scientists with a sparse matrix problem to solve. Others come from researchers like myself, who work on algorithms for sparse matrix and related graph problems. Researchers of both types who maintain their own web pages or ftp sites for their matrices include:
• Harwell/Boeing Collection, Iain Duff, Roger Grimes, John Lewis. Click here for a description of the matrices in the original Harwell/Boeing Collection.
• Matrix Market, Roldan Pozo, Karen Remington, Ron Boisvert, Richard Barrett, Jack Dongarra.
• University of Basil collection, Olaf Schenk.
• Pajek networks, V. Batagelj and A. Mrvar.
• Oberwolfach model reduction benchmarks, E. Rudnyi, and many others.
• the Gould, Hu, Scott collection
• NETLIB LP test problems, David Gay.
• SPARSKIT collection, Yousef Saad.
• NEP collection, Zhaojun Bai, David Day, Jim Demmel, Jack Dongarra. Click here for a description of the matrices in this collection.
• Hans Mittelman's LP test set
• C. Meszaros' LP test set
• Parasol matrices, Jacko Koster.
• Sep Kamvar's web matrices.
• Reijo Kouhia's set (source of the Cylshell group).
• Jean-Claude maintains a Sparse Integer Matrices Collection.