Credit Karma is a new site designed to help people learn their credit rating and provides other simple financial tools in a fairly accessible way. Some of those tools, such as a Home Affordability Calculator and a Loan Calculator can be used without registering (for free). It also has some very accessible and up-to-date financial information throughout the site.
Obviously, you probably don’t want students using sensitive personal information during a class lesson to analyze their credit scores. However, some of the tools and information on the site could possibly be used for artificial amounts to help English Language Learners develop an understanding of financial concepts.
And students might want to use the site at home to help understand their personal financial questions. I haven’t seen a site that offers this level of accessibility. They’re obviously encouraging users to make certain choices based on site ads, but in a quick review of their site it seemed like the information was pretty objective.
You might also want to look at The Best Sites For Learning Economics & Practical Money Skills and The Best Sites For Students To Create Budgets.