The Guardian Project is about more than just apps. All of our code is open-source in order to move the collective ball forward in mobile security efforts. In addition we are building developer-focused libraries, tools and source code for you to add security-oriented features and capabilities to your own apps.
Wind: Off-Grid Services for Everyday People
PanicKit: system-wide panic responses
CacheWord: Passphrase Caching and Management
TrustedIntents: flexible trusted interactions between Android apps
NetCipher: Secured Networking
IOCipher: Virtual Encrypted Disks
libsqlfs: filesystem on top of SQLite/SQLCipher
libsqlfs provides a complete virtual disk on top of a SQLite or SQLCipher database. The virtual disk is encrypted and contained in a single file, which can be easily moved around, copied, shared, etc. It is a standard FUSE filesytem that can work on Android, GNU/Linux, and perhaps also macOS.