Touge is a set of utility classes released into the public domain.

ReSTClient

A class to simplify java.net.HttpURLConnection for common rest-style API operations.

No external dependencies.
One file, public domain, drop sources in any project easily.
Supports vistor-style error handling, header customization.
Simple deserialization support.
Programmatically create URLs with URLBuilder.
Synchronous or asynchronous (Future-style) calling modes.
Optional debug output of requests and response data.
Examples: http://kgilmer.github.com/touge/
Binaries: https://leafcutter.ci.cloudbees.com/job/restclient/lastSuccessfulBuild/artifact/org.touge.restclient/dist/
Javadoc: https://leafcutter.ci.cloudbees.com/job/restclient/javadoc/

OSGiUtil

A class for common functions with the OSGi service registry.

Only requires standard OSGi API as dependency.
Supports vistor-style service and bundle access.