Programming Language: C# and PHP
C# = Provides the user with the interface and also renders each page using a stripped down and extremely modified Firefox
PHP = Allows the user to enter in the URL that they wish to have EISE display
Open Source: Yes. You must be an ES40 qualified developer to get your hands on the source code though (some aspects of the code are parts of other copyrighted ES40 projects).
Reliability: About 90% of the time EISE will properly display a webpage similarly to an iPhone. With each new version of EISE, though, we will be improving the reliability of the build.