This page lists delicious replacements and thoughts and feedback about them.
See also the wish list at autonomo.us.
Classic tags on the left, structured tags on the right SemanticScuttle is a social bookmarking tool (based on Scuttle) experimenting new features as hierarchical tags, collaborative descriptions or OpenID authentification.
Student run project from the University of Minnesota: We want you to get your bookmarks from any computer, anywhere, whether you're at home, work, a library, or at school. We want to create a place where people can share their bookmarks with friends, family, and co-worker. We want to create a fun, flexible, and fast alternative to standard browser bookmarking.
SiteBar is a solution for people who use multiple browsers or computers and want to have their bookmarks available from anywhere without need to synchronize them or take them along.
gnizr™ (gə-nīzər) is an open source application for social bookmarking and web mashup. It is easy to use gnizr to create a personalized del.icio.us-like portal for a group of friends and colleagues to store, classify and share information, and to mash-it-up with information about location.
This is an "open source" version 2 under development. A target is allowing a federated infrastructure with shared search indices, etc.
Del.icio.us like. Written in Perl. Seems to not be developed anymore, but works well.