CRM Software usually includes lead management tools, so you might want to look into something like Really Simple Systems or Sugar CRM!
Check out Marketo. They're one of the key players in the lead management space right now.
I advice you to try Comindware Tracker. It became cloud not long ago but testimonials are very positive.
Jannet, Comindware Tracker is not a lead management tool. I am not sure why you are recommending this.
you might want to try Saleswah CRM (Basic licenses) - cloud based - first 3 licenses including admin are free.
Full discloser: I am the founder of Saleswah CRM
sorry, it must be my mistake, I thought about it more and you are right.