Stan - Programming language

Stan is an open source programming language created in 2012.

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Stan is a probabilistic programming language for statistical inference written in C++. The Stan language is used to specify a (Bayesian) statistical model with an imperative program calculating the log probability density function. Stan is licensed under the New BSD License. Read more on Wikipedia...

Stan website
Stan Wikipedia page
There are at least 774 Stan repos on GitHub
file extensions for Stan include stan
Stan is written in C++
Stan on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 134 users using Stan in 154 repos on GitHub
Pygments supports syntax highlighting for Stan
GitHub supports syntax highlighting for Stan
See also: (4 related languages)IA-32, R, MATLAB, Stata

Example from Linguist:

data {
  int<lower=0> N;
  vector[N] incumbency_88;
  vector[N] vote_86;
  vector[N] vote_88;
}
parameters {
  vector[3] beta;
  real<lower=0> sigma;
}
model {
    vote_88 ~ normal(beta[1] + beta[2] * vote_86
                     + beta[3] * incumbency_88,sigma);
}