This program can do the following calculations:
Delta V available calculated from either masses or units of fuel in craft.
Reverse rocket equation. Get needed fuel from desired delta V.
Rocket constructor program: Gives detailed figures on constructing a craft to your requirements.
Delta V from fuel calculator.
Fuel needed for delta V calculator.
Effective Isp calculator.
Thrust/weight calculator.
Acceleration calculator.
--For some reason Avast! gives a false positive...