Really Good UX - A library of screenshots for UX inspiration
Competitive Heatmap Analysis - Any website's heatmap data is at your fingertips
Laws of UX - Key maxims that designers must consider when building UX
SendView - The best way to track your competitors' email marketing.
Owletter - Keep an Eye on Your Competitors' Newsletters
Monitor Backlinks - Easy Link Management - SEO Tool for automatically checking your backlinks.