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The GNU Multiple Precision arithmetic library is available for anonymous
ftp from prep.ai.mit.edu (18.71.0.38) under /pub/gnu/gmp-1.1.tar.Z.

This is from the README file:

  GNU MP is a portable library for arbitrary precision arithmetic,
  operating on signed integers and rational numbers.  It has a rich set of
  functions, and the functions have a regular interface.

  I have tried to make these functions as fast as possible, both for small
  operands and for huge operands.  The speed is achieved by using fullwords
  as the basic arithmetic type, by using fast algorithms, by defining
  inline assembler for mixed sized multiplication and division (i.e
  32*32->64 bit multiplication and 64/32->32,32 bit division), and by
  hacking the code with emphasis on speed (and not simplicity and
  elegance).

  The speed of GNU MP is about 5 to 100 times that of Berkeley MP for small
  operands.  The speed-up increases with the operand sizes for certain
  operations, where GNU MP has asymptotically faster algorithms.