From Ehab Mostafa Bakr:
LdP Line is an application that calculates probit analyses according to Finney, which is used to illustrate the relation between stimulus and response in toxicological and biological studies. With the help of LdP Line you have the possibility to calculate correlation coefficients, make relative studies among several treatments and calculate the resistance ratio and significant intervals. Also, you are able to preview the relations between stimulus and response in toxicological studies. You can save your data in a file and reopen, reedit, and recalculate it any time later.