プログレスバー付で複数選択もできるJavaScript製アップローダー

Uploadify is a jQuery plugin that allows the easy integration of a multiple (or single) file uploads on your website.  It requires Flash and any backend development language.  An array of options allow for full customization for advanced users, but basic implementation is so easy that even coding novices can do it.

Uploadify is available under the GPL and MIT licenses.  This allows Uploadify to be used in a number of applications and commercial products.

via uploadify.com

これはよさげ。
MITライセンス。一時期GPLとのデュアルライセンスだったのかな

via ひひーん！