Excellent program. A couple of other tools too.
http://s-audio.systems/blog/my-programs/
The program allows you to calculate a voltage or current regulator based on different chips.
* LM317 (LM150 , LM350) voltage regulator
* LM317 (LM150 , LM350) current regulator
* L200 voltage and/or current regulator
* TL431 precision shunt regulator
* TL431 precision shunt regulator (with LM317)
* M5237 3-terminal adjustable regulator
* 78xx series voltage regulator
* 78xx series current regulator
* uA723 precision voltage and/or current regulator
http://s-audio.systems/blog/my-programs/