Top Open-Source Tools on GitHub for Personal Knowledge, File Sharing, and Media Backup

Lightweight Self‑Hosted Note‑Taking (Memos)

Memos is an open‑source, self‑hosted note‑taking platform designed for developers and small teams. It combines plain‑text note creation, document management, and collaborative discussion while offering strong Chinese language support and privacy‑first defaults.

Technology stack: Go (backend), React.js (frontend), and SQLite for storage, providing high performance and easy portability.

🦄 Free and open source

🚀 Docker‑based quick self‑hosting

📜 Plain‑text first with partial Markdown support

👥 Private or public memos

🧑‍💻 RESTful API for programmatic access

📋 Embed memos via iframe 🔖 Tag‑based organization

📆 Interactive calendar view

💾 Data migration and backup utilities

Typical Docker deployment (replace /path/to/data with your desired storage location):

docker run -d \
  --name memos \
  -p 5230:5230 \
  -v /path/to/data:/var/opt/memos \
  ghcr.io/usememos/memos:latest

GitHub repository: https://github.com/usememos/memos

Cross‑Platform Offline File Transfer (LocalSend)

LocalSend is an open‑source alternative to Apple AirDrop that enables fast, encrypted file sharing across Windows, Linux, macOS, Android, iOS, and other platforms without any external server.

Key technical characteristics:

✅ Peer‑to‑peer transfer using local network (Wi‑Fi or hotspot)

🔐 HTTPS encryption and a built‑in REST API for discovery and control

🛡️ Fully offline – no cloud dependency, enhancing data privacy

📱 Supports desktop (Windows, Linux, macOS) and mobile (Android, iOS, Fire OS)

Docker example (exposes both TCP and UDP ports used by the protocol):

docker run -d \
  --name localsend \
  -p 5333:5333 \
  -p 5334:5334/udp \
  -v /path/to/config:/config \
  ghcr.io/localsend/localsend:latest

GitHub repository: https://github.com/localsend/localsend

Self‑Hosted Photo & Video Backup (Immich)

Immich provides a high‑performance, self‑hosted solution for automatic backup, organization, and sharing of photos and videos. It is optimized for both desktop and mobile clients and stores all media on a private server under the user’s control.

Core components and stack:

Backend: Node.js (NestJS) + TypeScript Database: PostgreSQL Object storage: compatible with local filesystem or S3‑compatible services

Frontend: React (web) and native mobile apps (iOS/Android)

Key features:

🔐 OAuth2 authentication and fine‑grained access control

🕒 Timeline view for quick navigation by date

🔎 Metadata, EXIF, and tag‑based search

⚡ Fast upload/download with chunked transfer

🖼️ Automatic thumbnail generation and video preview

Typical docker‑compose.yml snippet (replace YOUR_PASSWORD and paths as needed):

version: "3.8"
services:
  immich-server:
    image: ghcr.io/immich-app/immich-server:latest
    container_name: immich-server
    environment:
      - DB_PASSWORD=YOUR_PASSWORD
    volumes:
      - ./uploads:/usr/src/app/upload
    ports:
      - "3001:3001"
    depends_on:
      - immich-db

  immich-web:
    image: ghcr.io/immich-app/immich-web:latest
    container_name: immich-web
    ports:
      - "3000:3000"
    depends_on:
      - immich-server

  immich-db:
    image: postgres:13-alpine
    container_name: immich-db
    environment:
      - POSTGRES_PASSWORD=YOUR_PASSWORD
    volumes:
      - ./pgdata:/var/lib/postgresql/data

GitHub repository: https://github.com/immich-app/immich