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Insertion sort, Selection sort, Bubble sort, Shell sort, Quicksort, and Heapsot. All optimized and ready to be experimented with. This is the framework for a Java application that speed tests various sorting algorithms (because there's usually little need to write one's own in production programs). Several popular algorithms were left out because I didn't feel like implementing them. Included in this list are counting sorts, radix sorts, merge sorts, and the introsort. All are interesting, but I get bored quickly.