Can anyone say me which is the best software for designing transformers?

I need to design small step down power transformers for some toys and want to design some for inverters which has double windings for charging purpose alsoCan anyone say me which is the best software for designing transformers?Attached are several links to transformer design software:



http://www.intusoft.com/mag.htm



http://www.softwaregeek.com/transformer-鈥?/a>



http://www.mag-inc.com/design/software



http://poweresim.com/

sea ray

sea doo