I used Auctioneer, found it very helpful. But it couldn't (at the time) do the things I wanted to do. My scripts didn't have any UI or fancy graphics, just outputting text to the console.

I very much doubt it. There's a lot more functionality to Auctioneer then what was mentioned. Also, there are other popular auction add-ons, I think they would have just said it if they created Auctioneer.