eBay Tweet Bot
eBay Tweet Bot is a Twitter bot that tweets eBay listings that match specific criteria (eBay category, price min/max, keywords, etc.). It’s written in Python and uses simple, JSON-based configuration.
It is an open source project under the MIT license, although I am currently only doing maintenance work on it (e.g. updating dependencies with security issues).
I used eBay Tweet Bot to create Nintendo Big Tymers, a Twitter account that posts any Nintendo-related auctions over $500.