How can I add real estate tools to my website?

I am building a website for my husbands business. www.tobarhomeloanservicesinc.com It’s a real estate site so I wanna have cool tools on it like a mortgage calculator, a tool to search for properties currently on the market, a tool to check property comps for clients to know the value of their property, a tool Check Rates both wholesale and retail, etc. I have found a couple of websites that offer the mortgage calculator and rates but they link the viewer to their website which obviously I don’t want. Don’t mind paying a reasonable price just dont know where to start. HELP