Abstract
The paper is devoted to engineering applications of Optim library. The library, created by paper authors, is implements bioinspired optimization algorithms. The Optim contains classes for optimization with use of evolutionary algorithm (single and multiobjective optimization), artificial immune system and particle swarm optimization. The Optim library is well suited for engineering problems with floating point representation of design variables. The paper contains description of library and methodology of transferring data between Optim and auxiliary programs used for objective function calculation. The numerical examples of optimization of mechanical structures by using Finite Element Method for objective function evaluation are shown in the paper.