This repository contains Stratum, a free and open-source two-factor authentication (2FA) app for Android with Wear OS support. It implements TOTP, HOTP, Steam, Yandex, and mOTP code generation algorithms with configurable parameters. The app features encrypted local backups with AES-GCM/CBC and Argon2id/PBKDF2 key derivation, import from over 15 third-party authenticator apps (Aegis, Bitwarden, KeePass, etc.), QR code scanning via CameraX, and a Material Design 3 UI. The architecture follows a clean layered pattern with a core library (Stratum.Core) containing domain entities, OTP generators, backup converters, and service interfaces, a Droid project for the phone UI, and a Wear OS project. The codebase is well-organized with dependency injection (Autofac), repository pattern for SQLite persistence, and unit tests. It demonstrates strong data engineering skills in reverse-engineering and parsing various backup formats, implementing custom cryptography for Ente Auth, and maintaining a large icon database. The project is actively maintained, targets .NET 10, and has localization in 27+ languages.
Muzei is a production Android live wallpaper application that rotates artwork from pluggable sources. The main app renders artwork through a custom OpenGL ES wallpaper service, persists artwork metadata in a Room database, and uses WorkManager to fetch and update artwork. Sources are exposed through a ContentProvider contract; built-in sources cover featured art, gallery photos, and a single image, while the muzei-api module provides a public SDK for third-party source apps. A companion Wear OS app syncs artwork via the Play Services data layer and provides watch complications. The repository also contains a Python 2 Google App Engine backend and a static web frontend for the muzei.co featured-art archive and admin scheduling, making the repo a multi-platform product rather than a pure mobile app.
AnExplorer is a native Android file-manager application (package dev.dworks.apps.anexplorer) that exposes a Storage Access Framework-compatible DocumentsProvider layer over many storage backends: external/internal storage, USB OTG, root shell, FTP/FTPS, cloud storage (Google Drive, Dropbox, OneDrive, Box via CloudRail), app management, zip archives, recent files, and a note editor. It is a heavily customized fork of AOSP DocumentsUI: the core browsing state-machine, document stack, roots cache, recents persistence, and loader/cursor stack are AOSP-derived, with substantial product-specific additions for monetization, multiple build flavors, PIN security, settings, and Wear OS/TV support. The marketing site in web/ is a static Firebase-hosted page, not part of the application logic. The architecture is a classic Android monolith: Activities and Fragments drive the UI, Loaders and custom Cursor wrappers feed RecyclerView adapters, and each storage backend is implemented as a DocumentsProvider ContentProvider. Main entry points are DocumentsActivity and StandaloneActivity for browsing, plus the provider authority intents for the Storage Access Framework. External dependencies include AndroidX, Firebase Analytics/AdMob/Crashlytics, CloudRail, libaums for USB, Apache Commons Net for FTP, and an in-app billing library. Quality is mixed. The provider and cursor abstractions are reasonably flexible and a few utility components are genuinely reusable, but the codebase carries heavy technical drift: AGP 3.3 alpha, targetSdk 28, deprecated android.app.Fragment/AsyncTask/PreferenceActivity usage, duplicated flavor-specific classes, hardcoded ad and analytics identifiers, and third-party SDKs that are no longer actively maintained. It remains a functional, feature-complete consumer app rather than a modern engineering showcase.