Lightning Calendar

Organize your schedule and events in a calendar fully integrated with Thunderbird or Seamonkey email. .

Free Open Source Mac Windows Linux Thunderbird SeaMonkey

Apple Calendar

Keep track of your busy schedule and share it with others using Calendar. Create separate calendars — one for home, another for school, a third for work, and so on. See...

Free Mac iPhone iPad iCloud

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2). Use official binary packages from Linux/BSD distributions, with both i386 and x86_64...

Freemium Open Source Linux BSD Self-Hosted

Kontact

Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under one roof. Thanks to the powerful...

Free Open Source Windows Linux

qOrganizer

qOrganizer is a general organizer that includes a calendar with schedule,reminders,journal/notes for every day, to-do list. But provides features useful for students...

• Discontinued The project is no longer developed. Last version, 3.1.5, released in August 2010, can be still downloaded from SourceForge.

Free Open Source Windows Linux BSD

Blotter

Did you ever mark something in your calendar only to forget to check the calendar? No more. Blotter is a Mac application which places your weekly calendar right on...

Commercial Mac

Alarms

Intuitive task management/reminder app for the Mac. Just drag the items you want to be remembered of to the Alarms menu and place them on the time line. Due items can...

• Discontinued The product is no longer available on the official website and on the Mac App Store.

Commercial Mac

Do It Tomorrow

'Do It Tomorrow' is a Windows desktop application which helps you to track, organize, reuse, export, print, and summarize your tasks. Do It Tomorrow for...

• Discontinued The website and the app are not available anymore

Freemium Windows Android

Caliander

Caliander is the calendar that lets you create events faster and with less effort while keeping you on top of things with its smart and unique presentation. It uses the...

Commercial Mac

iDeskCal

iDeskCal embeds your calendar on your desktop, above your wallpaper but below your desktop items. With iDeskCal you can quickly and effortlessly know exactly what is on...

Commercial Mac

Stattoo

Your digital life has a lot of statistics: incoming mail, appointments, disk space. Stattoo "tattoos" stats right on your desktop picture: out of the way, but...

Commercial Mac