Free
iTaf
Handy no fuss alarm clock
Keep track of time, just the way you want to with 3D Clock
3D Clock is an app that creates a 3D clock in one of several styles on your desktop that you can drag, drop and configure. It's easy to use and good looking, though older devices and OSes may struggle with it both in terms of bugs and in terms of processing speed.
Cool App for Time Keepers
An alarm clock that sits on your computer's desktop
Tyme 2 - Track your time and sync across devices
A timer with alarms
A Much Simpler, Hassle-Free Way to Set Digital Alarms
Simple and intuitive clock for personal computers
The Most Compelling Alarm Clock for Your Computer
Keep Complete Track of What You Do On and Off Your Computer
Workflow Timer - Manage your day more effectively for free!
BreakTime - Remind yourself to take a break!
TimeHunk: A Free Mac Utility for Time Management
A simple timer app for your desktop