XMarks is a cloud based bookmark management platform.

Firefox Sync allows accessing your open tabs, bookmarks, history, passwords and preferences everywhere.

Linkman is a bookmark organizer that provides uniform access to bookmarks and favorites across browsers and even multiple computers.

Papaly is a simple social bookmarking tool to manage links.

Kifi creates a full-text index of every web page shared, making them easier to find in Slack, Google search.

Bubblehunt is search platform, where you can create own search system.