Apps, programs, games, and other software that are broken and abandoned because they didn’t turn a turn an immediate profit for the publisher.
The software is therefore “dead” to whoever created it, as in when one person tells another, “You’re dead to me.”
Some Person: Hey, what’s up with ONRUSH? There’s so much wrong with it, but there are no updates and Codemasters won’t answer emails about it.
Another Person: It’s deadware, my friend. The original company disavows all knowledge of ever having made it, despite their name being all over it.