Google Graveyard by SaaSHub - The Google Graveyard is the complete list of discontinued products by Google. Also known as 'The Google Cemetery'
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
The Google Cemetery - A list of dead Google products and why they died
Optimizely - A/B testing you'll actually use.
Startup Graveyard - History shouldn't have to repeat itself
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.