There are a million timer applications available online. It seems like creating a timer is something all programmers need to do at some point, somewhere between 'Hello world' and their actual software development career. Therefore, there are a lot, and I mean a LOT of crappy timer apps out there, particularly free ones.
Thankfully Timer by Apimac is not one of them. Timer is a useful, well put-together free Timer application for the Mac. Timer has three primary functions: stopwatch, countdown timer, and alarm clock, though it can also be used simply as a desk clock. The user interface is large and very easy to use, and feels very Mac-like, if not a little bit too shiny. There are three viewing modes in Timer: regular, iconized, and full-screen mode.
There is also a Pro version of Timer available with advanced features such as emailing a generated log file to a specific email address at a specific interval of time, but all of the basic timing features work fine in the free version.
There are a couple of knocks against Timer that should be noted. First of all, the app takes a long time to load for a simple timer app, making it feel heavy. Also, Apimac, the creator, named the application Apimac Timer rather than simply Timer. This makes it awkward to find in your Applications folder, particularly if you have a lot of apps installed. In fact, the first thing I did after installing it was to rename it to simply Timer, which is what it should have been named in the first place. I understand the developer's desire to brand their work, but when it comes at the expense of the user's experience, it's not worth it.
In any event, Timer is a useful free Mac timing utility.