If you want to share bookmarks with coworkers or friends, Stacks is a good option. It's got shared workspaces for collaborative knowledge bases, folders and smart tags for organizing collections, and the ability to annotate information from any browser or social network. Stacks also integrates with Google Drive and Notion, so it's a good all-purpose tool for collaborative bookmarking.
If you need to manage more than just bookmarks, Pincone lets you gather content from across the web and organize it in one place. With features like team creation for easy content sharing, powerful search and browser extensions for Chrome, Firefox, Safari and Edge, Pincone is good for managing and sharing content.