UXTesting - Discover how your mobile users feel
BareMetrics - SaaS Analytics for Stripe
Startup Timelines - How the frontpages of famous startups changed over time
SlipMetrics - Slipmetrics provide one-click Sales Analytics & Insights for Paypal.
Laws of UX - Key maxims that designers must consider when building UX
Probe - Revenue metrics. Sales metrics. Business costs. All in one place.