After searching for a web analytics software program solution for one of my blogs, I came across Piwik, and Open source web analytics software on piwik.org. This downlodable (GPL Licensed) software is one of the most popular installable wab analytics programs for tracking your website visitors in real time. One of the reason that Piwik became so popular, its because it was translated for more than 30 languages (Amharic, Bulgarian, Danish, German, English, Spanish, Dutch, Russian, Portuguese, Thai and other languages). Not all the translation are 100% finished, but you can really get a grasp of the investment of the Open-Source community in this platform.
Of course the main title for this web analytics software, is that is enables any website owner to get real time web analytics reports. You can't really compare it to other real-time web analytics solutions, because it is not a Software-As-A-Service (SaaS) solution, but an installable software that you need to install it on your server. The best usage for this kind of software is for private companies who don't want their statistics data to be hosted on shared enviroments and they want their data to be store inside the organization.
Piwik has an intensive documented open APIs that allows you to publish the data in many formats. You can easily get the top 10 visited pages of your website of the current month by just querying the database for example. You can get the statistics data in XML, JSON, CSV, serialized PHP and simple HTML. Furthermore, Piwik's UI is vull customizable, and you can easily customize it using drag&drop widgets.
You can download and try it by downloading the Piwik software through their official website. The size of the software is 3.5MB and it is currently in version 0.5.5.