MyChime is a really simple hourly chimer/time announcer. Configure it to only chime (using the classic digital watch beep) only speak the time (12 or 24h clock) or both. It can also be configured to perform its hourly actions only at a defined time interval or only when a headset is connected.
The app is also accessible to hard of hearing people: you can set it to vibrate every hour.

The goal behind this app was to make something really simple and small which would consume as little resources as possible: service only runs if any of the hourly activities is enabled the audio file is pretty small code is clean; unlike other hourly chimes out there which are full of unrelated features bloating the app unnecessarily.