Aria2是一个多平台轻量级，支持HTTP、FTP、BitTorret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），BitTorret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Widows可能用过IteretDowloadMaager，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。
Liux下的软件截图：
Widows下的软件截图
特性：
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