A number of people have written and published plugins for Hotwire. Mostly these are at a fairly early stage of development.

Hotwire Plugins

Mercurial Plugin

The mercurial plugin introduces a number of commands to help with managing Mercurial (aka hg) repositories. There is some discussion of it in the http://groups.google.com/group/hotwire-shell/browse_thread/thread/dbe56cb65bc3bbb9#.

Beagle Search

This is at a fairly early stage. For more info, read the discussion and (2).py download the plugin.

Shell Alias Import Plugin

This is a simple plugin to import your shell aliases and convert them to hotwire aliases. Read the announcement and download the plugin.

Other Plugin Code

Some code can be seen in this discussion.

Write your own plugin

To write your own, start by reading the ExtendingHotwire page.