Isoelectric Point Calculator is QT application to calculation of isoelectric point of given protein or peptide. It can do this using 7 diffrent pK values sets: EMBOSS, DTASelect, Solomon, Sillero, Rodwell, Patrickios and Wikipedia. It is fast and free. For more information go to project site.
if you want tweak the appearance of this and other qt apps (e.g: enable menu fade and/or animations) , you can usesimply download and click to use