The Java Helper Library provides a set of helper functions to simplify the process of connecting your chat application to LivePerson. The Helper Library is not required to interface with LivePerson. You can implement your own interfaces or use and incorporate the code and examples provided by the Helper Library into your code.
Getting from A to B in the most cost effective way can be difficult if you're just guessing as you go. TaxiMe is an application that provides users with cost estimates for cab fares and trip information for major cities in the U.S. and Canada. This means users can plan their journeys beforehand and know exactly what the costs involved will amount to. TaxiMe's API allows access to cab contacts and rates for these different cities.
The Federal Register is touted as "The Daily Journal Of The United States Government". Its website, federalregister.gov, allows access to the documents published there, which include proposed rules, final rules, public notices, and Presidential actions. It's a pretty interesting and useful look into what the US Government is doing, and how it might affect your life. Amazingly enough, it has a full-featured API, which is a truly open source project, to allow access to the Federal Register within applications.