FreeNicovideoDownloader is free, easy to use and allows you to download any video clips from Nicovideo.jp with the highest quality possible. Simply paste the Nicovideo.jp video URL to the Free Nicovideo downloader, press add, and the video will be downloaded. FreeNicovideoDownloader is a totally clean and safe program.
What's new in this version:
Version 3.0 updates download script.