I am about to run some a/b and multivariate tests for some landing pages.
In the past I used google website optimizer, but I always had problems when dealing with subdomains.
The documentation for gwo is poor and the various approaches I tried, made me loose lots of time..
I am considering to use a commercial / alternative platform and I would like to know your opinions.
My tipical scenario is to present a landing page and a conversion page located on a subdomain.
This website has a list of tools: http://www.wingify.com/conversion-blog/15-free-ab-split-testing-resources/
Some are free.