1. CRM Systems: Tools like Salesforce or HubSpot can track customer interactions and segment lists accordingly. 2. Email Marketing Platforms: Services like Mailchimp, Constant Contact, and Sendinblue offer segmentation features. 3. Analytics Tools: Google Analytics and other data analysis tools help in understanding user behavior and preferences. 4. Marketing Automation Software: Platforms such as Marketo and Pardot can automate segmentation and targeting processes.