Welcome to the uDig 2.0.0.RC1 release.
Download the package appropriate to your platform, unzip and run:
Windows and Linux packages includes a Java Runtime so you really can unzip and run without making any configuration changes to your Machine. On Mac OSX uDig is able to check for Java Advanced Imaging and install if needed.
To get started with uDig:
This is a release candidate, prior to the creation of a stable 2.0.x series.
Internally the package structure has changed from net.refractions.udig to org.locationtech.udig allowing developers to upgrade their plugins in anticipation of the 2.0 release.
The 2.0 stable series is a stepping stone anticipating the migration to LocationTech and Eclipse Luna (4.4).