Rosy Etta
Rosy translates into 40 languages using Google Translate as a backend. It's created by Google.
Roshambo
Roshambo is the classic game of Rock-Paper-Scissors. This robot will play with you. Just add it to a wave (or go to the sample wave) and say "rock", "paper" or "scissors" in a blip.
Created by Cihan Duruer.
Wave Participant Map
An experimental Google Wave Robot/Gadget combo that adds a participant map to each wave.
The robot adds a gadget to the root wavelet. Participants must op-in to share their location and can turn it off at anytime. The robot watches for client location changes and uses Wave state to update maps in real time (should work with playback too).
Complety
Uses the Google Search API to replace "???" in a blip (after it's submitted) with a suggested word.
Yasr
Replaces emoticons in the wave (after blip submitted) with smiley images.
Bloggy
Publishes the contents of a wave to a blog site.
Cartoony
Replaces the text of every submitted blip with a cartoon balloon that contains the text instead. Colors the balloons based on username.
Tweety
Tweets wave blips to twitter, and displays tweets from it.
Stocky
Automatically detects stock symbols from a blip, and continuously updates the blip with the live stock price. The stock symbol must be prefixed with "$", like "$GOOG".