The best replacement for gmp is glp.

The best alternatives to gmp are rated as following:
★★★★★  glp
★★★★  lump sum
★★★  cgmp
★★★  iso
★★  usp
★★  haccp
★★  lmp
★  non gmp
★  gcp
★  cost plus
★  iso 9001
★  mpfr
★  gmp
★  bcmath
★  hard bid
  nsf
  fda
  lump sum contract
  not gmp
  iso 9000
  isb
  qsr
  stipulated sum contract
  iso 13485
  stipulated sum

Your alternative for gmp is not listed? Suggest!
Speaking about gmp, one probably shouldn't forget about mpfr.

Other search terms related to gmp and their ratings are:
★★★★★ mpfr
★ gcc
You have in mind a companion for gmp and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gmp in all years. Click on graph for more.
gmp
glp
lump sum