After JBidwatcher stopped supporting multisniping several years ago, I switched to Auction Sniper for eBay for my eBay sniping needs. (Sniping, for those who may be unaware, is a way to bid on auctions at the last minute, so you don’t get into a bidding war with other buyers, and multisniping is a very useful feature where you can set bids for multiple auctions at once but only pay for the first one that actually wins.)
However, the developers of both apps now say that eBay has changed its login procedures so much that they can no longer keep up, and are deprecating their apps.
Thought this might be worthy of a mention in TidBITS. I’ve been a happy user of Auction Sniper for years; this is going to make my eBay experience more difficult and possibly more expensive.