Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
Firefox Sync - Bring your Firefox bookmarks, tabs, or passwords wherever you go with Firefox Sync. Share between computers and mobile devices. Get Firefox now!
Stash.ai - AI-powered, cross-device bookmarking
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
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Diigo - Diigo is a powerful research tool and a knowledge-sharing community