Diigo is a social bookmarking tool. You may tag bookmarks, annotate webpages, and access your work from any device.
elink turns web links into visually appealing newsletters, web pages and website embeds.
Flipboard is an iPad app, and it allows you to curate your own resources into a magazine AND you can read content curated by others.
Pinterest is a social network that allows users to visually share, and discover new interests by posting images or videos to their own or others' boards and browsing what other users have pinned..
Symbaloo is a visual bookmarking tool that makes it simple to organize your web resources. With an account you can access your bookmarks from everywhere with any device and share your online resources with others.
Keep is part of G Suite, and it is an online post-it note app. You may add labels, colors, checkboxes, and images, and you can even create collaborative notes. There is an iOS app that syncs with your web based account.