WHMCS Alternatives?

I am looking for some WHMCS alternatives that are either free or paid(preferably with monthly subscriptions). No need for automation API/modules and etc, all will be done manually. Product needs to be able to support products such as dedicated servers, VPS and etc.

So far, I've found these: -BoxBilling(Seems to only focus on shared hosting) -ClientExec -Blesta

I don't need many features, just basic invoicing, recurring payments and etc.

Thanks.