Hi there Vipetrul and welcome to the community it is really a nice site with very helpful information hope you find your way here...
i know a couple of indicators that can tell you if the market is oversold or overbought they are the RSI and the STOCHASTIC you can find more information on them here :
Learn to Trade the Stochastic Oscillator Video
Learn to Trade the RSI Indicator
hope thats help
best luck..
Houssam