Hypershoot - Bookmarking tool made for designers
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Basket - A note taking application for KDE. Lots of features.
Firefox Sync - Bring your Firefox bookmarks, tabs, or passwords wherever you go with Firefox Sync. Share between computers and mobile devices. Get Firefox now!
Linkpack - Save, read and share your links
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.