http://manorhelper.ucoz.ru/
Don't use packets, so cant be detected by server side. Also have some other protection methods. Authors says, that it can be synchronized with server-time, so can be very exact.
3-days trial version available, but not for lasts version. Price - about 40 usd.
PS. I don't test it :)
PSS. If somebody needs - can translate from russian functional and manual.