Will's right, we don't have enough information to help with suggestions.
Are you looking for user traffic analysis?
google analytics, smarter stats, hubspot, pardot
Are you looking for a performance analysis?
loadimpact, New Relic,
or maybe system/site performance from just page load and external evaluation?
sonarwhal from Microsoft, pingdom, google page speed
let us know what you're trying to address or solve and we'll see if we have suggestions to help!