Charge Smart lets you pay your student loan payments via
a credit card for a fee (Visa, MasterCard & Discover, but currently NOT American Express).
You may be able to pay your property taxes with
a credit card for a fee either directly through your county or through a 3rd - party service provider such as Official Payments.
Many colleges will let you pay for all or part of the tuition and housing costs with
a credit card for a fee.
You may be able to pay your Federal Income taxes with
a credit card for a fee.
Kiva allows you make loans with
a credit card for no fee.
The most important difference is the one I underlined above for Redbird — you can load the card directly with
a credit card for no fee.