Open Source Android File Sync Apps

SymmetricDS is database replication and file synchronization software. It is a platform-independent, web-enabled, and database-agnostic synchronization tool. With initial data load, bidirectional change data capture, conflict resolution, and data transformation, it is a comprehensive data replication solution.

ClipCascade is a free, open-source clipboard synchronization application designed for sharing copied content between devices. It automatically transfers clipboard updates without requiring keyboard shortcuts or manual synchronization. Users can share text, images, and files across Windows, macOS, Linux, and Android. The software supports both centralized server synchronization and direct peer-to-peer connections. End-to-end encryption protects clipboard contents during transmission. Users can deploy their own server using Docker or Java, or connect through the available community server. A web dashboard provides access to clipboard activity and synchronization settings. Multi-user support, authentication, and per-device transfer controls make ClipCascade suitable for personal and shared environments.

RClone Manager is a free, open-source graphical application designed for managing cloud storage services through Rclone. It provides a centralized interface for configuring remote connections, transferring files, and synchronizing data across storage providers. Its built-in Nautilus file manager allows users to browse, rename, copy, move, and delete remote files. The application also includes previews for images, videos, audio files, documents, and text. Users can create automated workflows with scheduled triggers, folder monitoring, and notifications. Additional capabilities include cloud storage mounting, file serving, bandwidth controls, and real-time transfer monitoring. Built with Angular and Tauri, RClone Manager supports Windows, macOS, Linux, and beta Android functionality.

Syncthing Tray is a free, open-source desktop utility that provides convenient system tray access to Syncthing file synchronization. It displays synchronization status, connected devices, and shared folders without requiring users to open the web interface. The application shows transfer statistics, active downloads, recent changes, and synchronization errors. Users can pause or resume devices, rescan folders, and inspect synchronization logs directly from the tray. Syncthing Tray also provides desktop notifications, autostart configuration, and optional systemd integration. Its KDE Plasma widget and Dolphin file manager extension offer additional controls for Linux desktops. It supports monitoring multiple Syncthing instances and includes command-line utilities for managing synchronization operations.

BasicSync is a free, open-source Android application that runs the Syncthing file synchronization engine with minimal additional complexity. It enables direct file synchronization between devices without requiring a centralized cloud storage provider. The application controls when Syncthing operates, while configuration remains accessible through Syncthing's web interface. Users can synchronize folders stored internally or on external SD cards and USB drives. Automatic running conditions can pause synchronization according to network availability, battery status, or schedules. Android Quick Settings provides convenient switching between automatic and manual operation. Configuration import and export simplify migration between devices. The application also detects synchronization conflicts and integrates with Android's Storage Access Framework.

The DAVdroid project aims to provide a method to synchronize an Android Phone with a GroupDAV server.

HaveClip is a peer-to-peer clipboard synchronization tool. Ctrl+C on one computer, Ctrl+V on another. Clipboard is instantly synchronized across all your devices. It can handle all forms of text, images and even application-specific data. HaveClip is multiplatform. Copy something in one OS, paste in another. Supports Windows, Linux, Mac OS X, Sailfish OS and coming to Android.

Synchronize your Lotus Notes calendar to calendar on your Android device. It works only via Bluetooth.

One-Post - Aggregating social updates to common social media websites, using open source methodologies on an android platform. This project is being done as part of my final year dissertation at university. One-Post is open source and all contributions are welcomed

Secrets for Android is an app that allows you to securely store and manage passwords and secrets on your Android device. PCSecrets is an application that provides similar facilities for a PC. PCSecrets Sync is an Android app that provides a synchronization capability between the two. It makes use of the new synchronization interface introduced in Secrets for Android (SfA) 2.4. The app is essentially a service and has no direct user interaction (no user interface). The app can be installed from Google Play or the .apk file can be downloaded from here. Secrets for Android is available on Google Play. PCSecrets is available on SourceForge. Click on the web site link below for full documentation.

POJOsync is an easy to use Java Framework to synchronize plain old java objects (POJO) with other users.

CalDAV sync for Android ---- Stopped working on it. Doesn't make any sense to spend more time on it; I recommend e.g. DAVdroid as an opensource and ready-to-use solution on clientside. ---- For code look at: https://github.com/e7o-de/android.caldav

1) Generic UDP server to wrapper gamepad and joystick events to uinput. 2) Specific UDP client under Android (+2.2) that send events to UDP server.