Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Unmark - Hosted bookmark management app
Bookmark2 - Bookmarks2 is a powerful productivity tool that makes is much easier for anyone to save their links...
Shaarli - Shaarli is a minimalist link sharing software you can install on your own website
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
SemanticScuttle - SemanticScuttle is a self-hosted and web-based social bookmarking tool experimenting with new...