What are some alternatives?
When comparing iRefers and Post Affiliate Pro, you can also consider the following products
Hotmart - Hotmart is a free and complete platform to host and sell online courses.
DemandTools - DemandTools by CRMFusion is a data quality toolset for Salesforce CRM with features like deduplication, normalization, standardization, comparison, import, export, mass delete, and more.
Adwalnut - Adwalnut is a SaaS based affiliate tracking and reporting software provides conversions tracking, campaign management & reporting software.
17hats - The all-in-one business system for entrepreneurs.
Commission Junction - CJ Affiliate by Conversant (formerly Commission Junction)
Optmyzr - Optmyzr AdWords Tools. Optimization Solutions, Quality Score Tracker, Landing Page Checker, and more. Free Trial Available.