Google Shopping Performance Grader is a free tool that analyses your campaigns on 9 areas such as bidding, negative keywords and account structure and generates a beautifully designed report with actionable recommendations for your campaigns.
A simple AdWords companion tool with 4 features that:
1. Help generate keywords & key phrases
2. Create single keyword ad groups (SKAGs)
3. Optimize campaigns for CPA
4. Manage negative keywords in a unique way