Sicyon is all-in-one freeware tool for everyone dealing
with sci/eng formulae. The core of Sicyon is an
expression calculator and the principal features are:
estimate a function using variables, user-defined
functions and over 50 built-in functions;
plot/tabulate a function; find real roots, minimums,
maximums and definite integral of a function;
fit a function over data set; sophisticated units
converter; database reader with various physical
and chemical constants; various tools as add-in applications.