More of an analytics tool...
My experience with PPC management tools is that they are a waste of time. Unless you have a huge account with thousands of keywords.
They offer more confusion than they do help, however that is my experience with only really 1 PPC tool provider.
Is there anything specific you are looking for in terms of functionality?
Slightly off topic / but also on topic I found QuRegExmm a great tool for MAC OSX for testing RegEx. I use it for Google Analytics filter / goal / funnel configurations.
My opinion though is that to manage a PPC campaign properly you should use your Web Analytics software to help you optimise account performance.
* I realise I'm full of opinions today

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