Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
BookmarkSheet - Your bookmarks in Google Sheets
Lynkmark - One place for all your bookmarks
Annotate.tv - Optimize your learning on YouTube
Walling - Walling is your visual space to capture ideas and organize projects.