- GMP GNU MultiPrecision Arithmetics
- MPFR MultiPrecision Floating point numbers with Rounding
- MPFI MultiPrecision Interval Arithmetics package

- Standardized notation in interval analysis, R.B. Kearfott, M.T. Nakao, A. Neumaier, S.M. Rump, S.P. Shary, and P. van Hentenryck