What are some alternatives?
When comparing Net Transport and streamWriter, you can also consider the following products
aTube Catcher - aTube Catcher also can burn in DVD/VCD your videos without use any other third party software.
JDownloader - JDownloader is a free downloading tool that enables you to download files from over a hundred hosting sites. The tool is compatible with Linux, Mac and Windows operating systems. Read more about JDownloader.
Jaksta - Get great Video, Music and Radio downloaders and converters for your Windows PC and Apple Mac. Jaksta recorders are easy to use and fast!
TubeDigger - TubeDigger - video downloader from almost ANY site. Download videos from many various sites
Free Download Manager - It is a powerful modern download accelerator and organizer for Windows and Mac.
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.