APG is an OpenPGP implementation for Android.

License: GPLv3+

During the time APG developement was asleep, a fork of it called OpenKeychain was developed by Dominik Schürmann and quite a few contributors. This fork overhauled most of APG's GUI to work better with the current Android versions. It also introduced many awesome features.

APG 1.1.0 incorporates most of those changes and I'm very grateful for and impressed by their work.

Developers APG

Thialfihar (Lead developer)
Senecaso (QRCode, sign key, upload key)
Markus Doits

Developers OpenKeychain

Dominik Schürmann (Lead developer)
Ash Hughes (crypto patches)
Brian C. Barnes
Bahtiar 'kalkin' Gadimov (UI)
Daniel Hammann
Daniel Haß
Greg Witczak
Miroojin Bakshi
Paul Sarbinowski
Vincent Breitmoser

Libraries

Android Support Library v4 (Apache License v2)
Android Support Library v7 'appcompat' (Apache License v2)
StickyListHeaders (Apache License v2)
Android-Bootstrap (MIT License)
ZXing (Apache License v2)
BouncyCastle (MIT X11 License)
HtmlTextView (Apache License v2)
Android AppMsg Library (Apache License v2)