aria2

Aria2 is a lightweight, command-line download utility engineered for users who need high-speed, concurrent retrieval of files across HTTP, HTTPS, FTP, SFTP, BitTorrent and Metalink protocols. Originally developed by Tatsuhiro Tsujikawa and released under an open-source license, the engine is architected to maximize bandwidth by splitting each file into multiple segments that are downloaded in parallel, then reassembled automatically; the same core logic handles torrents and magnet links, offering selective file choosers, DHT, PEX, encryption and UDP trackers without launching a separate client. Configuration is driven by plain-text files or runtime arguments, so administrators can embed the executable into shell scripts, cron jobs, Docker containers or CI pipelines for unattended mirroring, nightly builds, ISO caching or cloud seeding. Lightweight binaries for Windows, macOS and Linux consume only a few megabytes of RAM, making the tool popular on headless servers, NAS boxes, router firmware and low-power SBCs where graphical interfaces are impractical. APIs exposed over JSON-RPC and XML-RPC allow front-ends, browser extensions and home-automation software to queue, pause or throttle transfers remotely, while built-in checksum verification, piece-based resume and server-side timestamp preservation ensure data integrity after interrupted sessions. Although the project ships a single package, its protocol-agnostic engine effectively replaces dedicated wget, curl, uGet or Transmission instances for power users who want one unified downloader. The publisher’s software is available for free on get.nero.com, with downloads delivered through trusted Windows package sources such as winget, always installing the latest release and supporting batch installation alongside other applications.