Pine

Alpine for OS/2
A port of Alpine for IBM's OS/2.
http://www.zeta.org.au/~nps/software/alpine/en/index.html

Doug Barton's PGP Filters
Bourne shell scripts that support GnuPG 1.4.x and 2.x. Includes filter to send or receive inline PGP, and scripts to verify and decrypt MIME PGP.
http://dougbarton.us/PGP/scripts/ppf/

Gopi Sundaram's comp.mail.pine FAQ
A collection of answers to questions that appear frequently in comp.mail.pine.
http://www.zrox.net/Mail/Pine/

Help and Patches for Pine
A collection of patches for Pine. It includes help for Pine and links to more sources of patches in the web.
http://staff.washington.edu/chappa/pine/

Nancy McGough's Page on Pine
Information about configuring Pine. Includes a list of links to resources about Pine.
http://www.ii.com/internet/messaging/pine/

OpenSSL Configuration for Pine
Help on how to configure Pine to be used with OpenSSL.
http://www.madboa.com/geek/pine-ssl/

Patches for Pine by Ryan Barret
A collection of patches to enhance Pine.
http://snarfed.org/space/software#patches

Peter Daum's PGP4Pine
A perl script to integrate PGP, up to version 2.63i, into Pine.
http://user.cs.tu-berlin.de/~gator/pgp4pine/

Peter Hanecak's PGP4Pine
Supports version 2.6.x, 5.x and 6.5.x and GnuPG version 1.0.0 and later. Source code and RPM packages are available also.
http://www.megaloman.com/~hany/software/pinepgp/index_body.html

PGPenvelope
A filter that allows you to use Pine in conjunction with GPG.
http://pgpenvelope.sourceforge.net/

Pine for OpenVMS
A port of Pine for OpenVMS.
http://server11.infn.it/pub/mailing/OpenVMS/pinevms.html

Pine on Mac OS X
Notes on building and running pine under Mac OS X.
http://www.madboa.com/geek/pine-macosx/

Pine Privacy Guard
A filter written in Perl that allows you to use Pine and GPG to sign, encrypt and decrypt messages.
http://quantumlab.net/pine_privacy_guard/

Pine UTF-8 FAQ
Questions and answers on an unofficial patch for Pine to allow it to correctly send and read UTF-8 encoded mail.
http://www.suse.de/~bk/pine/FAQ.html