I knew that there were precedents to Google Desktop (notably the cool Beagle Project from the Ximian guys, among others), but I didn’t know that there were stable, released apps that did the same thing years earlier. Today I came across an O’Reilly Network article that talks about ZOË, a program that indexes your email for you, and lets you search it. Get this: it runs a web server and search interaction happens with web pages. While it does not index files or instant messages like the Google Desktop does, the email part is almost exactly alike, and was available over two years earlier.