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Rainlendar - Customizable desktop calendar

GPS-monitoring : easily record a GPS-track travel and be able to watch an entire group of people.

Warm up your cold email inbox, and never land in spam anymore!

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Organize your life — it’s about time!

A simple calendar with events (optional recurring and reminders), week numbers and a customizable...

Open Source

Access and edit your contacts from personal, business, and other accounts with the Contacts app.

GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.

Get Sherlock's mail. Solve his mysteries. 🕵📬

GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME...

Automagically scan biz cards into LinkedIn/Gmail contacts

Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.

Open Source

Mailbird is the best email client for Windows 7, 8 and 10

Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.

gsimplecal is a lightweight calendar application written in C++ using GTK2.

Open Source