The OpenNMS Community makes four builds of the OpenNMS software platform available at any given time. These builds vary in purpose, from deployment ready to developer specific to those who wish to live on the cutting edge. You'll need to pick from one of the following options:

stable 

The latest officially released stable version of OpenNMS. The current stable series is 1.10, so "stable" will always install the latest OpenNMS 1.10.x release. The current stable version is 1.10.9. If you are putting OpenNMS into a production environment for daily use, this is the recommended version to install.

testing 

A nightly build of the code that will be part of the next stable version of OpenNMS.

unstable 

The latest officially released development version of OpenNMS. This may have more features than the stable version, but it may also contain bugs that have yet to be discovered or triaged. The current unstable version is 1.11.90 in the 1.11 series.

snapshot 

A nightly build of the very latest development version of OpenNMS.

From here on, we will refer to the release you've chosen as: RELEASE.