hi all,
free solver
interalg for global nonlinear optimization with specifiable
accuracy now can handle categorical variables, disjunctive (and other
logical) constraints, thus making it available to solve GDP, possibly in
multiobjective form.
There are ~ 2 months till next OpenOpt release, but I guess someone may find it useful for his purposes right now.
See
here for more details.
Regards, D.