RoboMix is described in the paper "Robotic Hierarchical Mixing for the Production of Combinatorial Libraries of Proteins and Small Molecules", by L.V. Avramova, J. Desai, S. Weaver, A.M. Friedman, and C. Bailey-Kellogg. Default values on the form are for the dye-mixing plan described therein.
This web-based demonstration version provides limited capabilities: at most 6 reactants, each with the same number (at most 3) of variants, all at the same concentration, using a fixed stoichiometry with equal molar amounts of reactants mixing to produce the same molar amount of a single product. The full, unrestricted Python source code may be obtained for academic use by contacting Chris Bailey-Kellogg.