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The functional model of the old calculator series Wang 700 and 15VSM
...While Wang 700 were just programmable calculators, Soviet machines were almost complete computers taking into account their advanced CPU command set, huge RAM volume, ability to work with wide set of peripheral devices including the video terminal 15IE (15ИЭ) and existence of BASIC and other programming languages written as loadable applications. Still I consider them as calculators also due to some aspects exclusively specific to calculators. The project is intended for research and education purposes.
Fast C library for relation algebra using binary decision diagrams.
Kure is a C library which provides manipulation of relations and operations of relation algebra using a fast implementation using binary decision diagram. It provides a Lua based domain-specific embedded programming language to conveniently manipulate and work with relations. For instance, given relations R, S, the tupling of them can be computed using [R,S] and they can be composed using R*S.