FiniteFields.xlsm uses VBA code to generate the tables of opposite, inverse, and square roots for every element in Fp.
EC* are elliptic curve on real numbers and Fp: the naming pattern is EC(a,b)-Fp-G(x,y)-NX.xlsm where (a,b) are the elliptic curve equation coefficients, Fp the finite field, (x,y) the generator point, and X the cardinality of the EC(Fp) group.
Calc equivalent speadsheet might be ready soon... feel free to contribute them.