Since you’re mentioning multiple projects I wanted to mention my app Caato Time Tracker+ as well: http://www.caato.de/timetracker+

It’s very simple and streamlined for painless, manual time tracking. Our free plan lets you track multiple projects, add notes, export your data to CSV and send it via email with only a few clicks.

Our pro plan ($4.99/month) offers folders, Excel export and realtime syncing to our iPhone app and other Macs.