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There are several machines still being used but the number of vendors and diversity of designs has shrunk
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The SIMD Maspar and AMT DAP are focusing on database and other niche markets such as signal processing. They are not considered mainstream any longer.
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The MIMD nCUBE3 is not deployed and the nCUBE2 is uncompetitive in science arena. The company is focusing on video server market.
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The major pure MIMD distributed memory machines are the IBM SP-2 and Intel Paragon with the IBM having the best node CPU and the Paragon a superior network
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There is a spectrum of shared memory machines from
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CRAY T3D using Digital alpha RISC node where shared memory support translates into low latency message passing support for small messages on a basically distributed architecture
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Convex Exemplar uses HP's RISC node in a cluster of shared memory modules
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The SGI Power Challenge represents a powerful BUS based system in modest size systems with initial scaling viewing bunchs of Power challenge machines as a distributed memory system.
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