In some cases the big (bloated) Qalculate! application is not the most efficient and user friendly interface. Why should you, for example, need to load and learn to use the full application just to convert a simple binary number to a decimal, or to see what the price of a foreign product is in your national currency with the current exchange rates.
Therefore, I am now releasing three small utilities: Qalculate! Bases, Qalculate! Currency, and Qalculate! Units. The full libqalculate capabilities is of course available in these applications (arbitrary precision, expression evaluation, etc.), but in graphical user interfaces more fine-tuned for the specific purposes. The screenshots (http://qalculate.sourceforge.net/screenshots.html#qalclets) should be self-explanatory.