Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
Rons WebLynx - Rons WebLynx is a powerful windows desktop bookmark manager to organize large numbers of websites links. Store bookmarks in folders, tag, edit, rate and much more.
Firefox Sync - Bring your Firefox bookmarks, tabs, or passwords wherever you go with Firefox Sync. Share between computers and mobile devices. Get Firefox now!
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
EverSync - Everhelper - Eversync
Diigo - Diigo is a powerful research tool and a knowledge-sharing community