Galapagos underlying algorithm details?

I have been studying about single objective optimization and learned that GA is not a algorithm, but rather a category of algorithm. Apparently there are 4 popular GA in single objective optimization (Mathematics | Free Full-Text | Comparison between Single and Multi-Objective Evolutionary Algorithms to Solve the Knapsack Problem and the Travelling Salesman Problem).

I am wondering if there is some documentation for galapagos which details out exact algorithm used in it?

Check this out: