There are several popular affiliate marketing programs that bloggers and website owners can use to earn income:

1. Amazon Associates: It is one of the largest and most popular affiliate marketing programs, which allows you to promote Amazon products and earn a commission on sales.
2. Commission Junction (CJ Affiliate): It is a network of affiliate programs that offers a variety of products and services to promote, including digital products, physical goods, and services.
3. ShareASale: It is an affiliate marketing network that offers a variety of products and services to promote, including digital products, physical goods, and services.
4. ClickBank: It is a digital marketplace that specializes in selling information products, such as e-books and online courses.
5. Rakuten Marketing: It is a leading affiliate marketing network that offers a variety of products and services to promote, including digital products, physical goods, and services.
6. Awin: It is an affiliate marketing network that offers a variety of products and services to promote, including digital products, physical goods, and services.

When choosing an affiliate marketing program, it is important to consider the commission rate, the variety of products and services available, and the reputation of the program. It is also important to carefully read and understand the terms and conditions of each program to ensure that you are following best practices and not engaging in any prohibited or unethical activities.