What are the free and easy-to-use intermediary software used by real estate agents?

Roommate, good room pass these softwares need to be charged, the price is very expensive, and the functions are not so complete, such as collection function, data import function, release function and so on. Free software can look at the room online system, which is quite humanized. You can customize the opening or closing, and modify the fields of office buildings, houses, villas and other types. Provides collection and release functions. You can use one store first, and then buy other stores after use. It's reasonable. It costs nothing.