VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Tix - Tix is a state-of-the-art, cloud-based ticketing system that features fully integrated access controls, event management controls, multi-channel distribution capabilities, and a robust reporting suite.
Optimizely - A/B testing you'll actually use.
EventTitans - Top rated event management software
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.
Brushfire - Brushfire offers tools for online registration and event management.