@thi.ng/binary
100+ assorted binary / bitwise operations, conversions, utilities, lookup tables
@yaronkoresh/math
Implements mathematical operations using String type only, to avoid 32/64 bit integers limits.
bignumber.io
Library for representing decimal numbers and large integers of arbitrary-precision and using basic and complex mathematical methods, conversions between bases and logical operations with good handling of descriptive errors.
funary
Arbitrary precision binary operations library for Javascript.