W3Counter is the most powerful traffic counter I found. It tracks almost everything you need to know, like unique visits, search terms, locations of visitors, referrers and more. There is a Live View page showing real time data, such as Online Now, Twitter Mentions.
99Counters: Free Real Time Traffic Counters
99Counters offers real time traffic counters for free. It counts Daily Visits, Total Visits and Online Visitors with country flags. You need to sign up to use its service.
MixPanel: Real-time Website Analytics Service Goes FREE
Mixpanel is a real-time analytics service that helps improve internet applications by tracking how users interact & engage with them. The key point to make Mixpanel different is that Mixpanel is tracking events(actions) rather than pageviews.
Hummingbird: Web Analytics Updates 20 Times per Second
Hummingbird takes a different approach to web analytics by proving real time web traffic visualization – it allows you to see how visitors are interacting with your website in real time. It refreshes 20 times per seconds.
Trendcounter: Free Real-time Flag Counter
Trendcounter offers free Real-time traffic counter widgets. It’s similar to RadarURL which shows online visitor number. Trendcounter also has a flag counter separates visitors by country.
RadarURL: Free Real-Time Visitor Statistics
RadaURL is a real-time counter widget. Using the RadarURL Widget, You can count the number of online visitors, see where they are from (on a map) and where they are right now on your website.
