There are a few free tools that can help you build an email list without needing to spend money upfront. One of the most common tools is MailerLite. It offers a free plan that allows you to create landing pages and email forms. Another good option is ConvertKit’s free plan, which is simple to use and designed for creators who are just starting out. You can also try Systeme.io, which gives you a way to create funnels and collect emails. These tools help you make sign-up forms, manage your contacts, and send emails to your list. If you want to collect emails directly from your website, tools like Mailchimp and Brevo (formerly Sendinblue) also have free plans. The main thing is to choose one that is easy to set up and gives you enough features to grow. What kind of free tool would you consider using first if you're just starting to build a list for affiliate marketing?