Press and Hold
Single-mechanic browser game when countless clicker games already exist.

Global concurrency tracker for holding a button, but it's a novelty with no purpose.
Bored developers, browser game fans
The Button (Reddit) · Cookie Clicker
Single-mechanic browser game when countless clicker games already exist.
Fun distraction surfacing weird Wikipedia entries, though WikiRandom already exists.
Manual portfolio tracker with allocation views, but Morningstar, Yahoo Finance, and Fidelity offer this free.
Facilitates piracy — Chrome Web Store already marked item unavailable.
DOM injection extension when similar Goodreads helpers already exist.
Useful book-finding shortcut, but Chrome Store shows item currently unavailable.