With the Olark widget installed on your website, your site visitors /customers can chat live with you (the operator) without having to fill out any contact forms or making phone calls.
You can connect Olark with popular instant messenger clients like Google Talk, Pigdin or Trillian (any client that supports XMPP or Jabber) and chat with customers directly from that IM client.
You may also ask your visitors for some information – like their name and an email address – before starting the live chat session. If you are offline, the chat widget turns into an email contact form or you can even hide the box completely.
Olark offers a free plan that allows up to 20 conversations per month and 5 concurrent chat session or the $15/month Bronze plan will get you unlimited conversations.