wallabag is an application for saving websites to read later - a 'read-it-later' service. The most famous one, right now, is Pocket. Wallabag is a free software alternative. You can self-host it or you can create a paid account at wallabag.it.
My cursory impressions - I've only been using it for a few days - is that it's quite good. I find the interface very simple, the Firefox plugin is easy to use, and I like how the saved articles look. I might (risk) trying the kobo application soon.