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Best Lightweight Calendar & Contacts for self-hosting

The 10 best Lightweight calendar & contacts you can self-host, ranked by community traction.

khal

Calendar & Contacts

Command-line calendar built on CalDAV

Replaces Google Calendar

★ 3.1k Medium setup MIT

vdirsyncer

Calendar & Contacts

Synchronize calendars and contacts via CalDAV/CardDAV

Replaces iCloud sync

★ 1.9k Medium setup BSD-3-Clause

calcurse

Calendar & Contacts

Text-based calendar and scheduling application

Replaces Google Calendar

★ 1.3k Easy setup BSD-2-Clause

AgenDAV

Calendar & Contacts

CalDAV web client with an Ajax interface

Replaces Google Calendar

★ 826 Medium setup GPL-3.0

Xandikos

Calendar & Contacts

Git-backed CalDAV and CardDAV server

Replaces Google Calendar, iCloud

★ 606 Medium setup GPL-3.0

Framadate

Calendar & Contacts

Online polling and meeting scheduling tool

Replaces Doodle

★ 600 Easy setup CECILL-B

Crab Fit

Calendar & Contacts

Open-source group availability finder for scheduling meetings

Replaces When2meet, Doodle

★ 531 Easy setup MIT

EteSync DAV

Calendar & Contacts

Local CalDAV bridge for EteSync encrypted accounts

Replaces iCloud Calendar

★ 331 Medium setup GPL-3.0

InfCloud

Calendar & Contacts

Web client for CalDAV and CardDAV servers

Replaces Google Calendar web

★ 89 Easy setup GPL-3.0

Horde Kronolith

Calendar & Contacts

Calendar application from the Horde groupware suite

Replaces Google Calendar, Exchange

★ 10 Hard setup GPL-2.0

Every option here is open-source and self-hostable, tagged Lightweight within the calendar & contacts category. Compare them on the individual app pages for setup difficulty and resource requirements.