We built a free tool for exactly this: https://itemsy.com/

You can save links in the web app, via email, browser extension or pull automatically by integrating with a Medium blog or any RSS feed. Link collections get automatically turned into an email newsletter that can be personal, public or shared within a group.

We recently launched 'Picked for you' which suggests links you might find interesting. Also, we launch new features daily so feedback and requests are more than welcome!