Google's Operations Research tools:

Go engine with no human-provided knowledge, modeled after the AlphaGo Zero paper.

OpenSpiel is a collection of environments and algorithms for research in general reinforcement learning and search/planning in games.

GTP engine and self-play learning in Go

Open source neural network chess engine with GPU acceleration and broad hardware support.

C++ wrappers for SIMD intrinsics and parallelized, optimized mathematical functions (SSE, AVX, AVX512, NEON, SVE, WebAssembly, VSX, RISC-V))

Hash function quality and speed tests

UCI chess engine

Vector class library, latest version

General purpose unsupervised sentence representations

Cute Chess is a graphical user interface, command-line interface and a library for playing chess.

KaHIP -- Karlsruhe HIGH Quality Partitioning.

Minisketch: an optimized library for BCH-based set reconciliation

A Hearthstone AI based on Monte Carlo tree search and neural nets written in modern C++.

Chess Query Engine

UCI Chess engine

Fast and memory-efficient ANN with a subset-search functionality

Benchmark showing the we can randomly hash strings very quickly with good universality

A simple chess engine to learn and play with

UCI Chess Engine

2048 AI

PQ Fast Scan

Parameterless and Universal FInding of Nearest Neighbors

Fast C++ implementation of https://github.com/yahoo/lopq: Locally Optimized Product Quantization (LOPQ) model and searcher for approximate nearest neighbor search of high dimensional data.

Quick ADC

A codenames bot playing the part of the spymaster.

Solvers and makers for Pencil Puzzles

DartMinHash: Fast Sketching for Weighted Sets

A C++ implementation of the minimal area enclosing triangle algorithm.