For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.

Extremely Fast Compression algorithm

Extremely fast non-cryptographic hash algorithm

http://torch.ch

Simple Dynamic Strings library for C

Library for the analysis of networks

libLBFGS: a library of Limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS)

Word Mover's Distance from Matthew J Kusner's paper "From Word Embeddings to Document Distances"

Murmur3 hash in C

This is a C implementation of variational EM for latent Dirichlet allocation (LDA), a topic model for text or other discrete data.

LZ4Frame Bindings and tools for Python

Word Embedding Revisted: Explicit Matrix Factorization

Bayesian stuff for recomendation ranking

scikit-learn: machine learning in Python

libLBFGS: a library of Limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS)