Raindrop is superb. One of my favorite "tiny apps". It just works.

One of its nicest features is that it can function as a mini-browser. For example, let's say you're working on a project where you need to have a lot of different sites open for documentation, guides, references and so on. Instead of opening them as tabs in a browser, you can bookmark them in Raindrop and then use Raindrop as the browser.