I've come up with a equation solver which I have named MedicalcCE for the health care professional.
It is loaded with about 18 formulas like serum osmolality, creatinine clearance, corrected sodium, and many more! The standard form of the equation is displayed and you just input the required data. Please read the disclaimer listed under Help/About from the top menu. I am working on a version which will allow the user to modify the equations or add new ones. The zip file is about 1MB but the installation only takes up 27 kb of memory space on the Palm-size PC. Just download, unzip, and run Setup.exe. If you would like to see an SH3 version send me a note and I'll put it on the site.