pdatastructs - Simple probabilistic data structures.
Gen - General-purpose probabilistic programming system with programmable inference.
monad-bayes - Library for probabilistic programming in Haskell.
Funsor - Functional tensors for probabilistic programming.
Pyro - Deep universal probabilistic programming with Python and PyTorch.
TensorFlow Probability - Library for probabilistic reasoning and statistical analysis in TensorFlow.
NumPyro - Probabilistic programming with NumPy powered by JAX for autograd and JIT compilation to GPU/TPU/CPU.
Edward2 - Simple probabilistic programming language.
Soss - Julia library for probabilistic programming via source rewriting.
PyMC3 - Python package for Bayesian statistical modeling and Probabilistic Machine Learning focusing on advanced Markov chain Monte Carlo (MCMC) and variational inference (VI) algorithms.
Ranked Programming - Ranked Programming Extension for Racket. Ranked programming is similar to probabilistic programming, except that the underlying uncertainty formalism is replaced with ranking theory.