There are literally thousands of literary agents, and they are already listed on great websites, so rather than attempt to reinvent the wheel, here are the sites we have found the most user friendly:
Disclaimer on agents: The wrong agent is worse than having no agent at all. Do your research on agents, and don’t jump to say yes to an offer of representation. Be prepared for the call from a literary agent with a list of questions. More on being prepared for the offer, and questions to ask before accepting, at THIS LINK. We also recommend highly that you check to make sure the agent isn’t on the Writer Beware Predators & Editors list, which is a very important coat of arms that we recommend you use to its full advantage.