Software used in designing converter?

Depending on the input and output specifications of current, voltage, ripple, duty-cycle etc. we usually choose following 2 approaches for our designs:
1) Design tool from National Semiconductor (now TI) - ONLINE
2) Power Integration design suite - DOWNLOADable / Online
Alternatively we also choose designs from other IC mfgs. too, depending on factors like bulk price, availability, lead time and reliability.
You can try either of above.

Thanks,
- JB -
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Thanks for the hair strip image, was trying to figure that out.its my pleasure to post here