Calendar apps
Calendars and time-blocking tools.
24 products
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Turn ON privacy with encrypted email, calendar and contacts
Free planOpen source
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Groupware that runs anywhere, built on tools you can trust.
Free planOpen source
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Native desktop email client for Mac, Windows, and Linux
Free planOpen source
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Contacts, calendars & tasks for teams.
Free planOpen source
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An Open Source Webmail for businesses and communities
Free planOpen source
S
Full-Time Open-Sourcerer & App Maker
Free planOpen source
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Find the best time to meet with a group poll
Free planOpen source
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The weatherman without the man — hyperlocal, automated weather forecasts.
Free planOpen source
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A research poll and scheduling service operated by TU Dresden's Chair of Data Protection.
Free planOpen source
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Private, encrypted, secure email with 10 GB free
Free planOpen source
D
CalDAV, CardDAV, and WebDAV for Android.
Free planOpen source
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The open source CardDAV, CalDAV and WebDAV server
Free planOpen source
O
Private, encrypted calendar in the cloud
Free planOpen source
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Stop double-booking yourself. Sync Google Calendar with Outlook & iCloud so all calendars,
Free planOpen source
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Hybrid workplace software for desk booking, room reservation and office coordination
Free planOpen source
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Decentralized platform for owning and controlling your data
Free planOpen source
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A smarter way to organize your academic life.
Free planOpen source
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Take notes, plan tasks, track habits.
Free planOpen source
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Online platforms to create, share and find events.
Free planOpen source
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IT documentation, ticketing and billing for small MSPs.
Free planOpen source
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Task manager and life management system with MCP support for AI agents
Free planOpen source
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Your cloud, your rules
Free planOpen source
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A time zone conversion app for cross-timezone collaboration
Free planOpen source
C
a text-based calendar and scheduling application for the command line
Free planOpen source