Similar to Cygwin

Apache Mahout

Apache Portable Runtime

Apertium

AppleWin

Aufs

Avahi (software)

Avidemux

Berkeley DB

Bhyve

Blackbox

Blink (browser engine)

Botan (programming library)

Cacti (software)

Calibre (software)

Progress Chef

Chromium (web browser)

Chrony

ClamAV

Claws Mail

Code::Blocks

Completely Fair Scheduler

Concurrent Versions System

CPython

Ruby MRI

Crystal Space

CUPS

Cygwin/X