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We present the software library libCreme which we have previously used tosuccessfully calculate convex-roof entanglement measures of mixed quantumstates appearing in realistic physical systems. Evaluating the amount ofentanglement in such states is in general a non-trivial task requiring to solvea highly non-linear complex optimization problem. The algorithms provided hereare able to achieve to do this for a large and important class of entanglementmeasures. The library is mostly written in the Matlab programming language, butis fully compatible to the free and open-source Octave platform. Someinefficient subroutines are written in C/C++ for better performance. Thismanuscript discusses the most important theoretical concepts and workings ofthe algorithms, focussing on the actual implementation and usage within thelibrary. Detailed examples in the end should make it easy for the user to applylibCreme to specific problems.

libCreme: An optimization library for evaluating convex-roof entanglement measures