Ask and Answer Questions. Oyogi has search facilities that enable users to query its knowledge base, but it is not a search engine in the traditional web sense of the term.

Ask and Answer Questions

coComment is a social software for following comments, like bookmarking comments

Technorati is a real-time search engine that keeps track of what is going on in the blogosphere — the world of weblogs.

Online bookmark service that uses tags. It’s bookmarklet creats a small toolbar on the page that can bookmark links, images and the page.

Social bookmark service that usese hierachical tags(clusters)

Social bookmark community where each bookmark has it’s own page. Features: tags, groups, discuss

open source clone of del.icio.us

Social bookmark community that uses Ajax. Features: tags, rating, follow other users, shoutbox.

Social bookmark service that uses thumbshots and tags

Social bookmark community that uses tags.

Social bookmarking service for shopping that uses thumbshots and tags.

social bookmark manager that uses hierachical categories.

yet another social bookmarking site that uses tagging.

Social bookmark manager that uses tags and categories. It’s special point maybe it’s batch edit, move bookmarks and import that extracts tags from the folder, title and desription