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Thunderbird   (Compare Project)

Very High Activity

Mostly written in C++

License: GPL-2.0+, LGPL, MPL-1.1

citadel   (Compare Project)

High Activity

Mostly written in C

License: GPL-3.0

Apache JAMES Project   (Compare Project)

Activity Not Available

Mostly written in Java

License: Apache-2.0

Bongo   (Compare Project)

Very Low Activity

Mostly written in PHP

License: GPL-2.0+

columba   (Compare Project)

Very Low Activity

Mostly written in Java

License: MPL-1.1

Icedove   (Compare Project)

Low Activity

Mostly written in C++

License: BSD-4-Clause-UC, GPL-2.0+, LGPL-2.1, MIT, MPL-1.1, PD/GWC

Buni Meldware Communication Suite   (Compare Project)

Activity Not Available

Mostly written in Java

License: LGPL

Evolution   (Compare Project)

Very High Activity

Mostly written in C

License: LGPL-2.1+

KDE PIM   (Compare Project)

Activity Not Available

Mostly written in C++

License: GPL-2.0+, LGPL

Fetchmail   (Compare Project)

Moderate Activity

Mostly written in C

License: GPL-2.0+

monotone   (Compare Project)

Activity Not Available

License: Unknown

tmux   (Compare Project)

High Activity

Mostly written in C

License: ISC

rxvt-unicode   (Compare Project)

High Activity

Mostly written in C

License: GPL-2.0+

mutt   (Compare Project)

Low Activity

Mostly written in C

License: GPL-2.0+

zsh   (Compare Project)

Moderate Activity

Mostly written in C

License: BSD-3-Clause

irssi   (Compare Project)

Very Low Activity

Mostly written in C

License: GPL-2.0+

MPlayer   (Compare Project)

High Activity

Mostly written in C

License: GPL-2.0+

Nmap Security Scanner   (Compare Project)

Very High Activity

Mostly written in C

License: GPL-2.0+

GNU Screen   (Compare Project)

Very Low Activity

Mostly written in C

License: GPL-2.0+

OpenSSH   (Compare Project)

Moderate Activity

Mostly written in C

License: BSD-3-Clause