**Homepage:** [[ https://pari.math.u-bordeaux.fr/ | https://pari.math.u-bordeaux.fr/ ]]
**Why should this be included in the repository?** While there are calculators (e.g. SpeedCrunch), statistics software (e.g. R), etc., there's nothing quite like PARI/GP available now. It's an algebra system aimed at number theory, but even if you're not using it to [dis]prove non-trivial zeros are on a critical line, it can be useful for much basic algebra. For example, type 274 / 834 + 369 / 528 into your typical calculator and you'll probably see ~1.0274 as an answer, while gp will return an exact answer of 75403 / 73392.
**Is it Open Source?** Yes, GPL'ed since version 2.1.0.
**Who and how many users do you anticipate will use this software?** Anyone who is interested in number theory will probably want it. I suspect anyone who has ever desired more than just your basic calculator will find merit in it, and may use it as well. As for how many people that is, I have no idea.
**Link to source tarball/zip file:** [[ https://pari.math.u-bordeaux.fr/pub/pari/unix/pari-2.11.2.tar.gz | Stable ]], [[ https://pari.math.u-bordeaux.fr/pub/pari/unstable/pari-2.12.0.alpha.tar.gz | Development ]], and [[ https://pari.math.u-bordeaux.fr/pub/pari/snapshots/ | Snapshots Directory ]].