A binary distribution of JOpera for Eclipse is currently available from this site. The latest version of JOpera is 2.6.0
To download and install JOpera,
simply tell Eclipse about the JOpera update site:
http://www.update.jopera.org/
You can also install JOpera from the command line.
JOpera 2.6.0 and above runs on Eclipse 3.7 Indigo on Java 1.6
JOpera 2.5.4 and above runs on Eclipse 3.6 Helios (32bit) on Java 1.6
JOpera 2.5.0 and above runs on Eclipse 3.6 Helios (32bit) on Java 1.5/1.6
JOpera 2.4.6 and above runs on Eclipse 3.5 Galileo on Java 1.5/1.6