Pc Organizer Anyone Knows A Good Organizer Application?

Anyone knows a good organizer application? - pc organizer

I'm looking for something for the PC, preferably free online and receive it from different teams. I should be allowed to lists of tasks, a schedule of regular activities to make (eg the purchase of X and every 20 days) will be informed of them (by email, or) a flag simple desktop.
Please do not recommend to Lotus and / or Outlook.