Similar to Cygwin

Eclipse (software)

EGS (program)

Element (software)

Embedded GLIBC

Enlightened Sound Daemon

Erlang (programming language)

Mule (software)

Etherpad

Exa (command-line utility)

Exaile

Expr

EZ Publish

F-Spot

Fetchmail

Fastest Fourier Transform in the West

FindBugs

Firebird (database server)

Firestarter (firewall)

Firewalld

Flask (web framework)

Flutter (software)

Foliate (software)