Really Good UX - A library of screenshots for UX inspiration
Panguin Tool by Barracuda Digital - See your website's Google organic visit data overlaid with Google's major algorithm updates and changes to easily identify the impact on your website. Technology by Barracuda Digital.
Startup Timelines - How the frontpages of famous startups changed over time
Whatsmyserp - Powerful Rank & Serp Tracking. Completely Free.
UXTesting - Discover how your mobile users feel
SendView - The best way to track your competitors' email marketing.