The Hubspot CRM is a great replacement for all the free users of LinkedIn who are missing the Notes & Tags options.
Here's how to set up properties on your Hubspot CRM to replace LinkedIn tags without having to fork out for a premium account.
Just go to Settings in the black navigation bar, find edit your contact properties or add new properties and then select Manage.
Next, click the blue Create a new property button and you will see this pop up. These properties will then appear on your Contact cards as a field for you to complete and which you can use to filter your contacts as you require.