Mentor Mob is a great online tool which allows teachers (and students too) to curate websites, documents, videos, etc. into playlists. You can even add quizzes to the playlist.
Teachers can embed their Mentor Mob playlists into a website or blog, and students can get to all the links and read descriptions or instructions that you leave for each one. You can also give students a link to the playlist that contains all the websites.
Here is an example of a playlist I used for students in my biology class. They were learning about how drugs interact with the nervous system. There is a lot of information about drugs on the internet, and I didn't want to let them loose and find inappropriate material. So I curated a list on Mentor Mob of websites I wanted them to use.
Create your own Playlist on MentorMob!
Here is a video explaining how to use and set up a Mentor Mob playlist.
I have seen other teachers have their students set up playlists as portfolios of their work. I haven't tried that yet, but it sounds like a great idea.