1. FMM3D: Flatiron Institute Fast Multipole Libraries. https://github.com/flatironinstitute/FMM3D
2. H2Lib: http://www.h2lib.org/
3. H2Opus: A performance-oriented library for hierarchical matrices. https://github.com/ecrc/h2opus
4. MAGMA: matrix algebra on GPU and multicore architectures. https://icl.utk.edu/magma/index.html
5. STRUMPACK: STRUctured Matrices PACKage, v3.3. http://portal.nersc.gov/project/sparse/strumpack/