Hi eXia,
This probably isn't the answer you're hoping for but Facebook is a relatively new platform. Given that, even the big ad automation SaaS providers with millions in funding (Kenshoo, Marin Software, Acquisio and others) have just recently in the last year or so launched worthwhile toolsets for managing Facebook ads at scale. I think you will need to be in a higher spend tier to get to a point where it makes sense to use a 3rd party tool for managing your Facebook ads. That goes for Paid Search as well.
I personally have not seen any free third party tools for managing Facebook ads.
We use Kenshoo and have had a great experience with them on both the Paid Search and Facebook ads.
Here are the minimums I can remember for the tools I've heard of/used:
Kenshoo: not sure the min on social, but to make the pricing worhtwhile, you'll need to be spending deep 5 figures on Facebook monthly
Marin Software: $20k
Acquisio: $10k min
SearchManager (a joint venture btwn American Express and Clickable. A strange union, I know.): I'm not too familiar with this product but they do appear to integrate with Facebook and the pricing starts at $150/month/5% of spend whichever is higher.
It would also help to know: what you are hoping to get out of the tool that you plan to use?