Competitive Heatmap Analysis - Any website's heatmap data is at your fingertips
Really Good UX - A library of screenshots for UX inspiration
Monitor Backlinks - Easy Link Management - SEO Tool for automatically checking your backlinks.
Startup Timelines - How the frontpages of famous startups changed over time
SendView - The best way to track your competitors' email marketing.
UXTesting - Discover how your mobile users feel