OPAC is described as ', Parallel Cooperative Optimization'. There are six alternatives to OPAC for Windows and Linux. The best alternative is MOEA Framework, which is both free and Open Source. Other great apps like OPAC are modeFRONTIER (Paid), Open BEAGLE (Free, Open Source), PardisEO (Free, Open Source) and ParEGO (Free, Open Source).
modeFRONTIER is a multidisciplinary and multi-objective optimization and design environment, written to allow easy coupling to almost any computer aided engineering (CAE) tool, whether commercial or in-house
(PARallel and DIStributed Evolving Objects) is a C++ white-box object-oriented framework dedicated to the flexible design of metaheuristics. Based on EO, a template-based ANSI-C++ compliant evolutionary computation library, it is composed of four modules: