Grabby is described as 'allows users to grab content from websites, organize it into collections, and turn it into stories. We parse website content automatically, and collections can easily be shared with your friends'. There are more than 100 alternatives to Grabby, not only websites but also apps for a variety of platforms, including Windows, Mac, Android and iPhone. The best alternative is Joplin, which is both free and Open Source. Other great sites and apps similar to Grabby are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Evernote (Freemium).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.