Bookmark OS
Description: Bookmark OS is a free, open source web application for organizing bookmarks and web resources. It features bookmark management, tagging, search, inline images and notes, categorized views, and team collaboration features.
Type: software
Pricing: Open Source
Diigo
Description: Diigo is a social bookmarking website that allows users to bookmark web pages and highlight or annotate parts of the pages. Users can categorize their bookmarks, search through bookmarks, and access bookmarks from any computer.
Type: software