Beware of this site. The site itself will not cause you any problems, but if you are making a deal (ex selling or buying a RuneScape account) there is a good possibility you will be scammed. Use common sense and if anything is too good to be true... it is.
The site itself is fine but you should definitely be careful of what you download there. To give a little more detail: it's mainly a Runescape classic/Runescape 2 cheating/autoing website as well as a "black market" for them.