Vimeo - Vimeo is a social media app that lets you share and capture videos. You can watch new videos in a variety of different categories, and you can share your own content right from your device. Read more about Vimeo.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Wistia - Host, manage, and track your videos with the best video marketing tools in the (known) universe.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
Kaltura - Video solutions for media, service providers, enterprises, and education - OTT TV, Webcasting, Enterprise YouTube, VPaaS – live and VOD.
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.