Butler - the IRC bot with class - version 1.9 has just been released. Features include a comfortable plugin API with some DSL support to enable quick writing of plugins, thorough localization support,
an access framework that bases on deny-per-default with hierarchical privileges, user and roles. A configuration framework, user-sessions (users can be recognized as the same user even if they leave visible range of the bot), flood controls, automatic paging of answers.
Butler also comes with an administration tool to create, start, stop, update and delete individual bots, view their logfiles and more.

The 1.9 series marks the beta series of butler2. There are still some known bugs, but as a whole the bot runs stable (my own instance ran 4 months straight, with the exceptions of restarts after updates).
Help with development is welcome, especially creating new plugins and testing.
Also butler currently does not work on windows. If anybody is interested in porting butler to work on windows too, it would be much appreciated.

More information about butler can be found on its website[1] and project site[2], there's also a quickstart guide[3] to get butler up and running within minutes. The first steps of a plugin writing tutorial is also online[4] and will be expanded within the next few days.

Butlers code is dual licensed under GPLv2 and the ruby license.

[1] http://butler.rubyforge.org - butlers website
[2] http://rubyforge.org/projects/butler - the project site
[3] http://butler.rubyforge.org/manual/quickstart.html - quickstart guide
[4] http://butler.rubyforge.org/manual/tutorial/plugins/tutorial_00.html - plugin tutorial