Anybody know of something like this for Mac?

If it had updates would try it. Honestly there are too many of this type of software in the free world. And most of the time it is more work than just putting the hours you worked in a spreadsheet. If I were to download this and use it then in 3months or 6months your going to update it. My computer is set to auto update the software and then it becomes useless. freeware doesn't experience this type of corporate greed. a list of 10 to prove my point:
http://listoffreeware.com/list-of-best-free-timesheet-software-for-windows/
And quite honestly many of them outclass your system by leaps and bounds. especially timogix.com online free (for up to 3 users. mobile friendly track from any computer or cell phone or tablet.

The description pretty much tells what this program does, so i'm not going to repeat it. :)

The installation is small and registration locally and simple with (name and) key provided.

It works as intended in it's core, so much for that. I just don't get what the "Provides you with many useful options." exactly could be, you can add or remove or edit a category, add a task, edit and delete it, start and pause it and finally backup and restore the data, that's it for useful options. The edit option doesn't seem to work properly or maybe it's by design, you can't change the start time anymore for a existing entry as it's greyed out, requiring you to delete that entry and making a completely new one.

You could probably use it for not only work hours but other things too that you want to know how long it took you or how much time you wasted with it in a month, simple things like shopping, jogging, gym, playing games, surfing, whatever else, which could help you plan things out better daily, monthly or even yearly, if you want. It's simplistic and shows the critical info, as initially mentioned, it works as intended and can be kept if you need to track certain times. For others it may not be that useful.

In essence, it's a time tracking program. Some free alternatives with similar features from what i could gather: CKZ TIME CLOCK FREE EDITION, Personal Task Manager, ManicTime, Kimai, eHour 2.

Installed without a problem.

The program is very basic - it's a basic time-keeping software and for that works very well. You can add a task, and it will start timing it, pause it, stop it etc. and it will give you the duration.

You can customise it and add clients etc. but in general because you've only got a time-keeping system that is probably more trouble than it's worth.

If it had an integrated invoicing or pricing system it would be far more useful i.e. where you could type in your going rate and it automatically gave you the amount to charge based on the time taken then that would've made the price worthwhile.

EWTC phones home every time it's started. Don't like that.

Tried 3 times but program does not installed to Win 10 Home x64.
No error message. Installation program appears to run normal, but no icons and no trace of program in
start menu.

Installed flawlessly on Windows 10. :-)

Looks like it's got a great combination of simplicity/complexity.
If you have several clients this is a keeper for sure - I will certainly consider upgrading.

Many thanks!