Here you can find all my irssi scripts. They and many more are also available from the official scripts page.
You can access the repository and the ChangeLog.
Automatically ignore people on autoaway notices (link).
Adds new powerful and customizable [Act: ...] item (chanelnames,modes,alias). Lets you give alias characters to windows so that you can select those with meta- (link).
Update: I created a new branch to integrate all those patches for chanact.pl here. Please be advised that this should not even be called beta.
Display IrcOps in current channel (link).
Adds an item which displays the current network activity (link). Needs /proc/net/dev.
BitchX TAB complete style (link).
Right aligned nicks depending on longest nick (link).
Hides duplicate lines (link).
Displays a small, changeing statusbar item to show irssi is still running (link).
Remembers the last person oping you on a channel (link).