Polar is another player in this space: https://getpolarized.io/ https://getpolarized.io/ ... as are Wallabag and Raindrop which a few other people mentioned.

Polar is another player in this space: https://getpolarized.io/ https://getpolarized.io/ ... as are Wallabag and Raindrop which a few other people mentioned. Seems like there's definitely a longtail here.