Aria2是一个多平台轻量级，支持HTTP、FTP、BitTorrent等多协议、多来源的命令行下载工具。Aria2可以从多个来源、多个协议下载资源，最大的程度上利用了你的带宽。Aria2有着非常小的资源占用，在关闭磁盘缓存的情况下，物理内存占用通常为4M（正常HTTP/FTP下载的情况下），BitTorrent下载每秒2.8M/S的情况下，CPU占有率约为6%。Aria2支持JSON-RPC和XML-RPC接口远程调用。
很多人在Windows可能用过InternetDownloadManager，是很好用的多线程下载工具。Aria2跟IDM类似，不仅可以多线程下载，还可以通过多来源进行下载，简单的说就是从多个镜像服务器同时下载一个文件，Aria2还支持BT协议，弥补了IDM只支持HTTP和FTP的痛点。
Linux下的软件截图：
Windows下的软件截图
特性：
Command-lineinterfaceDownloadfilesthroughHTTP(S)/FTP/SFTP/BitTorrentSegmenteddownloadingMetalinkversion4(RFC5854)support(HTTP/FTP/SFTP/BitTorrent)Metalinkversion3.0support(HTTP/FTP/SFTP/BitTorrent)Metalink/HTTP(RFC6249)supportHTTP/1.1implementationHTTPProxysupportHTTPBASICauthenticationsupportHTTPProxyauthenticationsupportWell-knownenvironmentvariablesforproxy: http_proxy, https_proxy, ftp_proxy, all_proxy and no_proxyHTTPgzip,deflatecontentencodingsupportVerifypeerusinggiventrustedCAcertificateinHTTPSClientcertificateauthenticationinHTTPSChunkedtransferencodingsupportLoadCookiesfromfileusingtheFirefox3format,Chromium/GoogleChromeandtheMozilla/Firefox(1.x/2.x)/Netscapeformat.SaveCookiesintheMozilla/Firefox(1.x/2.x)/Netscapeformat.CustomHTTPHeadersupportPersistentConnectionssupportFTP/SFTPthroughHTTPProxyDownload/UploadspeedthrottlingBitTorrentextensions:Fastextension,DHT,PEX,MSE/PSE,Multi-Tracker,UDPtrackerBitTorrent WEB-Seeding.aria2requestschunksmorethanpiecesizetoreducetherequestoverhead.Italsosupportspipelinedrequestswithpiecesize.BitTorrentLocalPeerDiscoveryRename/changethedirectorystructureofBitTorrentdownloadscompletelyJSON-RPC(overHTTPandWebSocket)/XML-RPCinterfaceRunasadaemonprocessSelectivedownloadinmulti-filetorrent/MetalinkChunkchecksumvalidationinMetalinkCandisablesegmenteddownloadinginMetalinkNetrcsupportConfigurationfilesupportDownloadURIsfoundinatextfileorstdinandthedestinationdirectoryandoutputfilenamecanbespecifiedoptionallyParameterizedURIsupportIPv6supportwithHappyEyeballsDiskcachetoreducediskactivity
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