What are the sites that offer recurring commission instead a flat option ?

Hosting companies and the reseller plans for the softwares usually offer the recurring commissions. It's on the basis of the customer retention option. So for example if you are sending the customer to the hosting company and that retains for 3 years, some hosts pay you retainer fee in the name of affiliate income. For example, dreamhost offers recurring affiliate income and flat out both options depending on your choice.

Same is the case with the subscription based model for the re-sellers and with the affiliate income. For example Zoho has the reseller option where people can make use of their customer sending capacity to get the money in the pocket.

Some of the companies you can use are:

1. Dreamhost
2. Zoho
3. Salesforce reseller