Saber is a production-grade, cross-platform Flutter application for handwritten note-taking. It is a monolith app with a few standalone packages: a custom vector-ink canvas engine (pen, pencil, highlighter, shape pen, laser pointer), page-based editor, image/PDF/SVG insertion, Quill text overlays, background patterns, shape recognition, and undo/redo. The main entry point is lib/main.dart, which wires routing, i18n, Sentry consent, sharing intents, and background sync. Notes are stored as versioned binary .sbn2 files via the self-contained packages/sbn library, with legacy .sbn support and migration logic. The application persists notes through a file manager responsible for CRUD, import/export, recently-used tracking, and directory watching. Nextcloud sync is implemented over WebDAV with client-side end-to-end encryption: file paths are hex-encrypted, content is encrypted, and conflicts are resolved using last-modified timestamps and a best-file strategy. Settings are managed through typed stow preferences and a large settings surface covering theme, writing tools, editor behavior, performance, and error reporting. Platform runners exist for Android, iOS, macOS, Windows, and Linux, with distribution metadata for Play Store, F-Droid, Flathub, AppImage, Snap, and Windows installers. The codebase is well-tested with unit, widget, golden, and format-compatibility tests, plus CI workflows for all major platforms. It is not a data/research repository; there are no notebooks, ML pipelines, or analytical datasets. Technical drift is moderate: the interactive canvas is a maintained fork of Flutter's InteractiveViewer, some dependencies are pinned or patched for F-Droid builds, and generated i18n files plus legacy format migration code require ongoing upkeep. Overall, this is a mature, actively maintained application with several cleanly separated components that can be reused in other Flutter projects.
Neo-Store is a modern, feature-rich F-Droid client for Android built with Kotlin and Jetpack Compose. It provides a full-featured app store experience for browsing, searching, installing, and updating free and open-source Android applications from multiple repositories. The app emphasizes privacy and security, integrating with Exodus Privacy to display tracker information, providing privacy scoring, and supporting reproducible builds verification. Architecture follows MVVM with Room database for persistence, Koin for dependency injection, and WorkManager for background sync, download, and installation tasks. The UI is fully composed with Material Design 3 and adaptive navigation. It supports multiple installation methods (root, Shizuku, session, system) and provides advanced features like download stats, mirror rotation, batch updates, and QR code repository scanning. The codebase is well-structured with clear separation of concerns: data layer (Room entities, DAOs, repositories), index parsing (v0/v1/v2), installer management, and a rich Compose component library. It demonstrates strong Kotlin idioms with extensive use of sealed classes, flows, and coroutines. While the code is largely modern, some areas (e.g., BLOB storage, LegacyInstaller) show technical debt. The project is actively maintained with frequent releases and community contributions.
Seal is an Android application that serves as a graphical frontend for yt-dlp, enabling users to download videos and audio from a wide range of websites. Built with Kotlin and Jetpack Compose, it features a Material Design 3 interface with dynamic color theming. The app manages download tasks through a state machine, supports playlists, custom command templates, cookies, SponsorBlock integration, and extensive format selection. It relies on yt-dlp (via youtubedl-android), FFmpeg, and aria2c as external engines, and uses Room for local database storage, MMKV for preferences, and Koin for dependency injection. The architecture is a single-activity Compose Navigation app with a foreground download service. While the codebase is well-organized and actively maintained, it exhibits some technical drift (e.g., deprecated Accompanist WebView, minimal test coverage) and contains a few monolithic modules. Notable reusable components include a standalone color science library implementing CAM16/HCT, a backup/restore utility for database objects, and a custom motion system for Material Shared Axis transitions.
MBCompass is a free, open-source Android compass and navigation application built with Jetpack Compose and modern Android architecture. It provides a digital compass with true/magnetic north support, declination correction, and sensor fusion for accuracy. The app integrates online and offline maps (via OSMDroid and MapsForge), GPS location tracking, and full track recording capabilities including start/pause/resume, GPX export/import, and detailed statistics (distance, speed, elevation, ascent/descent). The UI follows Material Design 3 with support for dynamic theming, AMOLED dark mode, and multiple languages. The architecture follows a feature-based package structure with MVVM pattern, using Hilt for dependency injection, DataStore for user preferences, and Kotlin Serialization for track persistence. Key modules include a foreground service for GPS tracking, a sensor event listener with lifecycle-aware registration, and a repository pattern for track CRUD operations. The app is lightweight (~2 MB), privacy-focused (no ads, no analytics), and supports Android 6+ with target SDK 33+. While the codebase demonstrates solid engineering practices with clean abstractions and reusable UI components, there are signs of technical drift including deprecated LocationListener APIs, scoped storage concerns, and potential library version lag. The project appears actively maintained with recent changelogs, extensive translations, and community engagement via Weblate and GitHub issues.
This repository contains a fully functional Android application named 'Bluetooth LE Spam' that transmits crafted Bluetooth Low Energy advertisements to spoof a wide range of devices (Apple Continuity, Microsoft Swift Pair, Google Fast Pair, Samsung Easy Setup, Lovespouse) on nearby phones and tablets, triggering unwanted pop-ups and notifications. It also includes a spam detector that identifies BLE spam originating from Flipper Zeros and similar tools, running as a foreground service even on the lock screen. The application is built with Kotlin, Jetpack Compose, Material 3, Room database for persistence, and uses both legacy and modern (BLE 5) advertising modes. The codebase is well-structured around an interface-based advertisement set generator pattern and a queue handler for cycling through attacks, but it is explicitly unmaintained by the author and many exploits are patched on modern OS versions, limiting practical impact. The architecture is a standard Android single-activity app with multiple fragments and foreground services; the theme system (dynamic color, custom nav bar, status badges) demonstrates reasonable front-end craftsmanship.
MonsterMusic is a full-featured Android music player application built with Jetpack Compose, Material3, and Media3 (ExoPlayer). It provides local music playback with extensive audio effects including a 10-band equalizer, echo/reverb, spatial audio (virtual surround), pitch/speed control, and real-time FFT visualization. The app reads audio metadata via a bundled copy of the JAudioTagger library, supporting ID3v2, MP4, FLAC, Ogg, WAV, AIFF, and WMA formats. It includes synchronized lyrics display (LRC/SRT), playlist management (M3U import/export), sleep timer, home screen widget, and a drawer-based UI for browsing songs, albums, artists, genres, and folders. The codebase is a hybrid of Kotlin (app logic) and Java (embedded library), with moderate architectural separation via ViewModel, Repository, and Room persistence. While feature-rich, the project shows signs of stalled maintenance; the embedded metadata library is large and may have drifted from upstream, and several Compose APIs are marked experimental. The app is functional but not production-polished, with some dry code and unfinished fragments.