aria2 は, 複数のサーバーから複数のプロトコルを用いてファイルを高速にダウンロードできるユーティリティです. コマンドラインインターフェースなので, wget によく似ていますが, BitTorrent もダウンロードできます. HTTP(S)/FTP/ BitTorrent (DHT, PEX, MSE/PE) /Metalink をサポートしています.

This release fixes the bug that aria2 does not listen on the address given in --interface. It also fixes the bug of HTTP redirect when Location header field contains an absolute path which contains "://". aria2 now doesn't emit "Max payload length exceeded or invalid" error when the number of pieces is very large in BitTorrent. It also allows missing <params> element in XML-RPC request as specified in XML-RPC specification. Also in XML-RPC, <i4> and <int> elements must be 32 bits signed integer from this release. The --deferred-input option was added. It prevents aria2 from reading all URIs from -i file, and makes aria2 read URI one by one as it is needed. This will save memory usage if -i file contains lots of URIs. Windows UNC path support was added.