These are all totally unmaintained and just listed here for the record.
Privacy-enhanced browser
Orweb is a companion browser to https://f-droid.org/packages/org.torproject.android/, the port of Tor to Android.
Orbot anonymizes internet traffic by routing it through many different stages and you must have that enabled first, though root isn’t needed. Orweb disables certain other browser features that could be used to identify you.
Please note that Orweb is superseded by Tor Browser. Orweb is no longer maintained at all.
Run Debian on your phone
Lil’ Debi builds up a whole Debian chroot on your phone entirely using debootstrap. You choose the release, mirror, and size of the disk image, and away it goes. It could take up to an hour on a slow device.
Then it has a simple chroot manager that fscks your disk, mounts/unmounts
things, starts/stops sshd if you have it installed, etc. You can also then use
‘apt-get’ to install any package that is released for ARM processors. This
includes things like a complete real shell, Tor, TraceRouteTCP,
iwconfig/ipconfig, and other security and crypto tools. Works well with
https://f-droid.org/packages/jackpal.androidterm —just run /debian/shell to get a Debian shell.
The aim of Lil’ Debi is to provide a transparent and tightly integrated Debian install on your Android device. It mounts all of your Android partitions in Debian space, so you see a fusion of both systems. It’s even possible to have Lil’ Debi launch the normal Debian init start-up scripts when it starts, so that all you need to do is apt-get install and any servers you install will just work.
Lil’ Debi works with as few modifications to the Android system as possible. Currently, it only adds a /bin symlink, and a /debian mount directory. It does not touch /system at all.
Requires root: Yes, because it needs to run debootstrap, create dirs in /, mount/umount, etc.
produce professional-grade videos with your phone
Creating great stories is now easier than ever with StoryMaker. Our unique templates, overlays, and lessons guide you through the entire creative process. StoryMaker lets you edit your content right on your mobile, making it even easier to finish your story. Once you’ve finished, StoryMaker lets you publish your story to all of your favorite platforms.
GnuPG via gpgcli
GnuPrivacyGuard extends the gpgcli command line tool to bring an integrated privacy engine to your Android. It gives you command line access to the entire GnuPG suite of encryption software. It also serves as the test bed for complete Android integration for all of GnuPG’s crypto services, including OpenPGP, symmetric encryption, and more.
GPG is GNU’s tool for end-to-end secure communication and encrypted data storage. This trusted protocol is the free software alternative to PGP. This app is built upon GnuPG 2.1, the new modularized version of GnuPG that now supports S/MIME.
GPG aims to provide an integrated experience, so clicking on PGP files should “just work”. You can also share files to GPG to encrypt them. GPG will also respond when you click on a PGP fingerprint URL (one that starts with openpgp4fpr:).
Before using GPG, be sure to launch the app and let it finish its installation process. Once it has completed, then you’re ready to use it. The easiest way to get started with GPG is to install https://f-droid.org/packages/jackpal.androidterm. GPG will automatically configure Android Terminal Emulator as long as you have the “Allow PATH extensions” settings enabled.
Status: Unmaintained, use https://f-droid.org/packages/org.sufficientlysecure.keychain/
Notepad with lock
Simple app for taking notes that encrypts everything behind a password.
Status: Unmaintained.
ChatSecure Voice Messaging
This is a plugin for [[info.guardianproject.otr.app.im]]. It does not have any function on its own. For Your Ears Only… completely private, end-to-end encryption voice message recording, sending, receiving and playback.
ChatSecure Open Emoji Plugin
Plugin for https://f-droid.org/packages/info.guardianproject.otr.app.im/ to support for core emoji input and display. Based on “Phantom Open Emoji” project.
Disable untrusted certificates
Android 4+ allows you to disable certificates from the system Settings and root isn’t required, so try that first if you want to manually mess with the certificates. The app won’t work with Android 4+ anyway.
An app to manage security certificates on your phone also containing a version of the Android CACert keystore derived from Mozilla. If a certificate has recently become untrusted you can either install an update to this app or you can backup and remove certificates by yourself.
Requires root: Yes, it writes to the system partition. You will need a device that has the ‘grep’ command on it (via busybox: present on most custom ROMs). If the ‘save’ doesn’t work, then you will need to make your /system partition read-write by using a file explorer like https://f-droid.org/packages/com.ghostsq.commander or via a command in https://f-droid.org/packages/jackpal.androidterm.