I am looking to find guava-libraries in maven repository. It looks like guava is adding more features to google-collections library.
Bintray's JCenter is a superset of Maven Central as includes libraries from various repositories. Here's Google Guava.
You can click on "Set me up!" to get the instructions on how to configure your build tool to resolve from JCenter and on the "i" on a jar file to get the dependency declaration for your build tool.
You can also become a watcher to get notifications on new versions.