What are some alternatives?
When comparing iRefers and Systeme.io, you can also consider the following products
Hotmart - Hotmart is a free and complete platform to host and sell online courses.
AdsBridge - Split testing Landing page builder Conversion tracking PPC tracking
Adwalnut - Adwalnut is a SaaS based affiliate tracking and reporting software provides conversions tracking, campaign management & reporting software.
Affiliate - Make extra money when you share links with no extra work!
Commission Junction - CJ Affiliate by Conversant (formerly Commission Junction)
Voluum - Voluum is a cloud-based affiliate marketing tracker with trackers in 7 countries worldwide.