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UnitOOPS Software produces the chemical equilibrium calculation software REACT!, which is in use both in industry and in the classroom at over 25 Chemical Engineering college programs in the USA and overseas. The program was originally authored at Yale University by Professor James A. O'Brien, principal of UnitOOPS Software, for his own use in teaching Junior-level Chemical Engineering Thermodynamics. REACT! is now available for free by contacting UnitOOPS Software at the address below. Trivia: UnitOOPS Software gets its name from its origins in Chemical Engineering software. The core "Unit Operations" of Chemical Engineering are often referred to as "unit ops", while "OOPS" was adopted to emphasise our commitment to the use of Object-Oriented Programming Systems as a means of improving our development strategies.

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UnitOOPS Software is based in Orange, Connecticut.

The NAICS codes for UnitOOPS Software are [5112, 51, 511, 513].

The SIC codes for UnitOOPS Software are [73, 737].

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