I'm working on yet another alternative, which we're about to launch:

https://www.tefter.io/teams/free-trial

We charge 39$/month flat, no limitations on the number of users, links, lists.

The domain of bookmarking is definitely crowded, but we're focusing providing a solution where you forget you're dealing with bookmarks. With our browser extension, you can quickly jump between tabs, search you history and bookmarks either personal or your team's. There's also support for golinks style shortcuts, full-text search, a Slack app and even a cli app written in Elixir!