CalendarHub is a very useful and functional calendar application. It is completely free and has many enhancements to allow you to manage appointments and events on multiple calendars. It also includes a to-do list and easily integrates collaboration with other CalendarHub Users’ calendars.
http://www.calendarhub.com/
Toodledo is a simple but useful to-do list management tool. You can create folders, assign due-dates for tasks, add tags, goals, notes, and more.
Toodledo is completely free and very functional. However they offer additional features in their Pro and Pro-Plus packages which require a yearly fee.
http://www.toodledo.com/
The Kuku Klok is an easy-to-use online alarm clock. If your computer is in your bedroom, you can use it to wake you up in the mornings. It even works if the internet goes down after setting it.
But if your computer isn’t in the bedroom, you can find other uses for it, such as to remind you when your TV show, etc.
Kuku Klok can come in handy quite often!
http://kukuklok.com/