You want to trade some altcoins instantly with no account then go for Switch.ag
Want to trade any altcoins in a trusty DEX then go for SwitchDex.ag

The reason i say this is because Switch goal is to stop or at least give a break from this monopoly that exchanges have created. They manipulate the price of any alt that is not willing to adjust to their will. This actually happens a lot in the alt communities and i encourage anyone to read about these issues.