I use NetVideoHunter,
clipconverter.cc (mostly for youtube, there's an addon to show a shortcut),
savefrom.net for dailymotion
you can use ffmpeg's command prompt to get some streams, here's what worked for
katch.me (now dead) :
ffmpeg -i "[url ending in .3u8 found somewhere in the page's source]" -c copy [filename of your choice].ts
.ts is the extension, I don't remember if I could change it, I just sticked to it for simplicity then converted the file to mp4
in general you can google "download videos [website]" and it's possible to find instructions that work
