Here are some repos that use cibuildwheel.

Name CI OS Notes
scikit-learn github icon windows icon apple icon linux icon The machine learning library. A complex but clean config using many of cibuildwheel's features to build a large project with Cython and C++ extensions.
Matplotlib github icon windows icon apple icon linux icon The venerable Matplotlib, a Python library with C++ portions
MyPy github icon apple icon linux icon windows icon MyPyC, the compiled component of MyPy.
psutil github icon windows icon apple icon linux icon Cross-platform lib for process and system monitoring in Python
scikit-image github icon windows icon apple icon linux icon Image processing library. Uses cibuildwheel to build and test a project that uses Cython with platform-native code.
twisted-iocpsupport github icon windows icon A submodule of Twisted that hooks into native C APIs using Cython.
websockets travisci icon apple icon linux icon Library for building WebSocket servers and clients. Mostly written in Python, with a small C 'speedups' extension module.
pyzmq github icon windows icon apple icon linux icon Python bindings for zeromq, the networking library. Uses Cython and CFFI.
aiortc github icon apple icon linux icon WebRTC and ORTC implementation for Python using asyncio.
numexpr github icon travisci icon windows icon apple icon linux icon Fast numerical array expression evaluator for Python, NumPy, PyTables, pandas, bcolz and more
coverage.py github icon windows icon apple icon linux icon The coverage tool for Python
h5py azurepipelines icon windows icon apple icon linux icon HDF5 for Python -- The h5py package is a Pythonic interface to the HDF5 binary data format.
River github icon windows icon apple icon linux icon 🌊 Online machine learning in Python
PyAV github icon windows icon apple icon linux icon Pythonic bindings for FFmpeg's libraries.
Dependency Injector travisci icon windows icon apple icon linux icon Dependency injection framework for Python, uses Windows TravisCI
PyTables github icon windows icon apple icon linux icon A Python package to manage extremely large amounts of data
ruptures github icon apple icon linux icon windows icon Extensive Cython + NumPy pyproject.toml example.
aioquic github icon windows icon apple icon linux icon QUIC and HTTP/3 implementation in Python
google neuroglancer github icon windows icon apple icon linux icon WebGL-based viewer for volumetric data
pikepdf azurepipelines icon windows icon apple icon linux icon A Python library for reading and writing PDF, powered by qpdf
AutoPy travisci icon windows icon apple icon linux icon Includes a Windows Travis build.
Parselmouth github icon windows icon apple icon linux icon A Python interface to the Praat software package, using pybind11, C++17 and CMake, with the core Praat static library built only once and shared between wheels.
python-rapidjson travisci icon gitlab icon appveyor icon windows icon linux icon Python wrapper around rapidjson
Rtree github icon windows icon apple icon linux icon Rtree: spatial index for Python GIS ¶
KDEpy github icon windows icon apple icon linux icon Kernel Density Estimation in Python
cyvcf2 github icon apple icon linux icon cython + htslib == fast VCF and BCF processing
pybind11 cmake_example github icon windows icon apple icon linux icon Example pybind11 module built with a CMake-based build system
pybind11 python_example github icon windows icon apple icon linux icon Example pybind11 module built with a Python-based build system
dd-trace-py github icon windows icon apple icon linux icon Uses custom alternate arch emulation on GitHub
iminuit github icon windows icon apple icon linux icon Jupyter-friendly Python interface for C++ MINUIT2
jq.py travisci icon apple icon linux icon Python bindings for jq
matrixprofile travisci icon windows icon apple icon linux icon A Python 3 library making time series data mining tasks, utilizing matrix profile algorithms, accessible to everyone.
time-machine github icon apple icon linux icon windows icon Time mocking library using only the CPython C API.
CTranslate2 github icon apple icon linux icon Includes libraries from the Intel oneAPI toolkit. The Linux wheels also include CUDA libraries for GPU execution.
Tokenizer github icon travisci icon apple icon linux icon Fast and customizable text tokenization library with BPE and SentencePiece support
bx-python travisci icon apple icon linux icon A library that includes Cython extensions.
boost-histogram github icon travisci icon windows icon apple icon linux icon Supports full range of wheels, including PyPy and alternate archs.
pybase64 github icon windows icon apple icon linux icon Fast Base64 encoding/decoding in Python
TgCrypto travisci icon windows icon apple icon linux icon Includes a Windows Travis build.
etebase-py travisci icon linux icon Python bindings to a Rust library using setuptools-rust, and sccache for improved speed.
pyjet github icon windows icon apple icon linux icon The interface between FastJet and NumPy
numpythia github icon apple icon linux icon The interface between PYTHIA and NumPy
fathon travisci icon apple icon linux icon python package for DFA (Detrended Fluctuation Analysis) and related algorithms
Imagecodecs (fork) azurepipelines icon apple icon linux icon Over 20 external dependencies in compiled libraries, custom docker image, libomp, openblas and install_name_tool for macOS.
pyinstrument_cext travisci icon appveyor icon windows icon apple icon linux icon A simple C extension, without external dependencies
xmlstarlet github icon windows icon apple icon linux icon Python 3.6+ CFFI bindings with true MSVC build.
pybind11 scikit_build_example github icon windows icon apple icon linux icon An example combining scikit-build and pybind11

Add your repo here! Let us know on GitHub Discussions, or send a PR, adding your information to docs/data/projects.yml.

I'd like to include notes here to indicate why an example might be interesting to cibuildwheel users - the styles/technologies/techniques used in each. Please include that in future additions!