Here are links to various tools I have create surrounding board games. These include helper apps (mostly as fun side projects) as well as tools for Board Game Geek.
What a mouthful. This tool grabs you BGG wishlist and compares it to any auctions that roll in on BGG. If it finds any matches it generates an RSS feed item for you and publishes it. Slap the url into your favorite RSS reader to view them.
Run the script to ask BGG for your "For Trade" list. If you enter data in the right way, it will generate a nicely formatted table for Reddit, which you can post on r/boardgameexchange.