Currently I'm using Eclipse Indigo (v3.7) for Selenium WebDriver automation tests with Java. There is also Eclipse Juno (v3.8 - 4.2) available that I have never used.
What's the difference between Eclipse Indigo and Eclipse Juno?
Since 2006, the Eclipse Foundation has coordinated an annual Simultaneous Release. Each release includes the Eclipse Platform as well as a number of other Eclipse projects. So far, each Simultaneous Release has occurred on the fourth Wednesday of June.
Eclipse Indigo corresponds to platform version 3.7, while Eclipse Juno - to platform version 4.2. Juno has a lot of improvements on the UI, but this results in a bit slower performance that the previous versions. Personally, I would prefer using Indigo rather than using Juno.
Eclipse Juno has entirely a GUI with a lot of visual improvements. Although by design it is a lot more functional, it has been proved that Juno is quite slow, and I won't recommend using it at present.
From a Selenium point of view I don't think there would be a reason to switch to the newer version of Eclipse.
In my experience Juno was a LOT slower than Indigo, particularly when moving from one editor window to another. In fact I upgraded to Juno then downgraded again a week or so later as I found Juno unbearably slow, even on a quad core i7 PC.
The current release of Eclipse (at the time that I write this) is 'Kepler'. I'm now using Kepler for my mobile web app and Android development.
So, in summary, skip Juno and go straight to Kepler - here's the link; http://www.eclipse.org/downloads/
Hope this helps.
来源：https://stackoverflow.com/questions/16518030/difference-between-eclipse-indigo-and-eclipse-juno