they are for metatrader 4 they are auto trading bots, they will trade for you according to their strategy, as they have no desciptive files with them it would be a long process of experimentation to find out if any of them are any good or not, read the help on autotrading in the MT4 help for advice on how to use them and attatch them to a chart.
I found this other page from your link interesting Index of /_MT4_Experts this page is source code so if you understand programming you can open the source code and get some idea of what it is going to do.