Configuration system for Python applications

https://github.com/ipython/traitlets

Filters to enhance web typography

https://github.com/mintchaos/typogrify/

Low-level Unified Font Object (UFO) reader and writer

http://unifiedfontobject.org/

Script to normalize the XML and other data inside of a UFO

https://github.com/unified-font-object/ufoNormalizer

Ultra fast JSON encoder and decoder for Python

https://github.com/esnme/ultrajson

New features in unittest backported to Python 2

https://pypi.org/project/unittest2/

Python wrapper around libusb

http://pyusb.github.io/pyusb/

Converts HTML/CSS documents to PDF

https://weasyprint.org/

Character encoding aliases for legacy web content

https://github.com/SimonSapin/python-webencodings

Websocket client for python

https://github.com/websocket-client/websocket-client

Implementation of the WebSocket Protocol (RFC 6455 and 7692)

https://pypi.org/project/websockets/

Python utilities collection for building WSGI applications

https://palletsprojects.com/p/werkzeug/

Reading data and formatting information from Excel files

https://www.python-excel.org/ https://github.com/python-excel/xlrd

Python interface for XML parser library for GNOME

http://xmlsoft.org/

Seamless interoperability between C++11 and Python (cmake part)

https://pybind11.readthedocs.io/en/stable/ https://github.com/pybind/pybind11

Using nlohmann::json with pybind11

https://github.com/pybind/pybind11_json

Pybind11 bindings for the Abseil C++ Common Libraries

https://github.com/pybind/pybind11_abseil

Pybind11 bindings for Google's Protocol Buffers

https://github.com/pybind/pybind11_protobuf

Fast C++ regex library

https://github.com/google/re2

Persistent key-value database with built-in net interface

https://redis.io/

Persistent key-value database with built-in net interface

https://redis.io/

Persistent key-value database with built-in net interface

https://redis.io/

Persistent key-value database with built-in net interface

https://redis.io/

Controller and GCode generator for RepRap 3D printers

https://reprap.org/wiki/RepSnapper_Manual:Introduction

A fast redirector and access controller for squid

http://www.bsdnexus.com/retsina/index.htm

Rocinante is a lightweight configuration management software

https://github.com/bastillebsd/rocinante

Embeds the SQLite database engine in a Ruby extension

https://github.com/copiousfreetime/amalgalite

PostgreSQL driver for DBI-for-Ruby

http://ruby-dbi.sourceforge.net

SQLite3 driver for DBI-for-Ruby

http://ruby-dbi.sourceforge.net

Vendor independent interface for accessing databases

https://github.com/erikh/ruby-dbi

Ruby bindings for Datadog API

https://github.com/DataDog/dogapi-rb

Domain Name manipulation library for ruby

https://github.com/knu/ruby-domain_name

Ruby implementation of the Duo API

https://github.com/duosecurity/duo_api_ruby

Extension for dynamic libraries and binding functions

https://github.com/ffi/ffi/wiki

Ruby extension to Google Protocol Buffers

https://protobuf.dev/ https://github.com/protocolbuffers/protobuf https://github.com/protocolbuffers/protobuf/tree/main/ruby

Ruby extension to Google Protocol Buffers

https://protobuf.dev/ https://github.com/protocolbuffers/protobuf https://github.com/protocolbuffers/protobuf/tree/main/ruby

Ruby implementation of gRPC

https://github.com/grpc/grpc/tree/master/src/ruby

Ruby implementation of gRPC

https://github.com/grpc/grpc/tree/master/src/ruby

Ruby wrapper for hiredis

https://github.com/redis/hiredis-rb

Ruby bindings for MemCached

https://github.com/mperham/memcache-client

Mid-level packet manipulation library for Ruby

https://github.com/packetfu/packetfu

Parses SQL queries using a copy of the PostgreSQL server query parser

https://github.com/lfittl/pg_query

Fast, multithreaded and highly concurrent ruby web server

https://puma.io/ https://github.com/puma/puma

Fast, multithreaded and highly concurrent ruby web server

https://puma.io/ https://github.com/puma/puma

Fast Markdown converter for ruby based on discount

https://dafoster.net/projects/rdiscount/

Pure-ruby growl notifier

https://github.com/drbrain/ruby-growl

Message creator and parser for the SMB protocol family

https://github.com/rapid7/ruby_smb

Replaces accented characters with unaccented characters

https://github.com/SixArm/sixarm_ruby_unaccent

Ruby interface to the SQLite DB engine version 3

https://github.com/sparklemotion/sqlite3-ruby

Ruby interface to the SQLite DB engine version 3

https://github.com/sparklemotion/sqlite3-ruby