Herwig++ 2.0 release note (2006)
Other
Gieseke, S., Grellscheid, D., Hamilton, K., Ribon, A., Richardson, P., Seymour, M., Stephens, P., & Webber, B. (2006). Herwig++ 2.0 release note

A new release of the Monte Carlo program Herwig++ (version 2.0) is now available. This is the first version of the program which can be used for hadron-hadron physics and includes the full simulation of both initial- and final-state QCD radiation.

Herwig++ 2.0 beta release note (2006)
Other
Gieseke, S., Grellscheid, D., Hamilton, K., Ribon, A., Richardson, P., Seymour, M., Stephens, P., & Webber, B. (2006). Herwig++ 2.0 beta release note

A new release of the Monte Carlo program Herwig++ (version 2.0) is now available. The main new feature is the extension of the program to include simple hadron-hadron processes including the initial-state parton shower.