HubSpot CRM - Free CRM software for small businesses.
Supermetrics - Supermetrics condenses all the major vectors of data relevant to a user's marketing campaigns and helps them make sense of it all.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Airbyte - Replicate data in minutes with prebuilt & custom connectors
Bexio - Bexio helps small businesses manage their accounting, contacts and inventory.
Fivetran - Fivetran offers companies a data connector for extracting data from many different cloud and database sources.