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The official Lark/飞书 CLI tool, maintained by the larksuite team — built for humans and AI Agents. Covers core business domains including Messenger, Docs, Base, Sheets, Calendar, Mail, Tasks, Meetings, and more, with 200+ commands and 20+ AI Agent Skills.

A set of Ansible playbooks to build and maintain your own private cloud: email, calendar, contacts, file sync, IRC bouncer, VPN, and more.

Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.

A simple, semantic and developer-friendly time package for golang

  • carbon
  • date
  • datetime
  • time

A simple CalDAV (calendar) and CardDAV (contact) server.

  • python
  • caldav
  • icalendar
  • carddav

TickerQ is a fast, reflection-free background task scheduler for .NET built with source generators, EF Core integration, cron + time-based execution, and a real-time dashboard.

EspoCRM – Open Source CRM Application

  • crm
  • php
  • single-page-application
  • customer-portal