Not really. I found links to the Mini Nuke, the Ion Cannon, and the Enterprise a couple months ago. They worked in-game, but I never use them anymore.
stuff, i meant to edit, not make another post
oh well
There was a website about a year ago that housed every failed addon ever for the most part. Ion Cannon and some vehicles got out.
Mininuke has been around forever, you can find several downloads of it. I myself "fixed" it to bypass the crap-ons cache back in 2010.
These days you don't have to be crafty to find old stuff like you used to. I got the Ion Cannon from a friend years ago after spending quite a long time looking for a download.