3form Free Knowledge Exchange is one of the earliest examples of human-based computation and human-based genetic algorithm (Kosorukoff, 1998). It uses both human-based selection and three types of human-based innovation (contributing new content, mutation, and recombination), in order to implement collaborative problem-solving between humans. However, on May 8 2016 3 form was down due to technical issue.
References
3form Wikipedia(Text) CC BY-SA