EssentialPIM Alternatives for Mac OS X

Microsoft Outlook is a comprehensive personal information manager designed for managing email, contacts, calendars, and tasks.

Todoist is a leading task management and to-do list application designed to help individuals and teams organize their tasks, projects, and goals across various devices. It offers powerful features for capturing, organizing, and completing tasks efficiently.

Apple Mail is the default email client for macOS, iOS, and watchOS, offering a seamless and integrated email experience across Apple devices with features like rich text editing, multiple account support, and robust organization tools.

Lightning is a comprehensive calendar and task management add-on for Mozilla Thunderbird and Seamonkey, designed to integrate seamlessly with email. It offers robust features for scheduling, task tracking, and synchronization with various online calendar services, enhancing productivity directly within your email client.

Things is a highly acclaimed task manager designed for macOS, iPadOS, and iOS platforms. It offers a clean, intuitive interface to help users capture, organize, and complete their tasks and projects effectively. Praised for its minimalist design and powerful features, Things aims to make personal productivity effortless and enjoyable.

Postbox is a powerful and customizable email client designed for professionals managing high volumes of email. It offers robust features for organizing, searching, and managing multiple accounts efficiently, enhancing productivity through a clean interface and advanced tools.

Task Coach is a free and open-source personal task manager designed to handle compound tasks and notes. It's a versatile tool for organizing your to-do list with support for subtasks, categories, and tracking time spent on tasks, making it suitable for both simple task management and more complex project organization.

Doit.im is a powerful cross-platform task management and GTD service designed to help individuals organize their work and life. It offers synchronization across various devices, enabling users to manage tasks effectively based on the Getting Things Done methodology.

RedNotebook is a free and open-source desktop journal and diary application offering a clean interface and features for organizing notes, thoughts, and ideas with a calendar view, tag search, and basic text formatting.

Org-mode is a powerful and flexible mode for GNU Emacs, designed for note-taking, project planning, to-do list management, and authoring documents. It utilizes simple plain text files with intuitive markup.

Todo.txt is a simple yet powerful command-line task management system. It leverages a plain text file to store your to-do list, making it highly portable, easily searchable, and compatible with numerous tools and operating systems. Its minimalism offers a clean separation from complex feature sets, focusing purely on task management.

TreeSheets is a hierarchical data organizer and note-taking application that utilizes a unique tree-like grid structure to manage information in a highly visual and flexible manner. It supports various data types and offers features for brainstorming, list management, and spreadsheet-like organization within a unified interface.

Zimbra Desktop provides a unified interface for managing multiple email accounts, calendars, tasks, and contacts offline. It supports various protocols like IMAP, POP, CalDAV, and CardDAV, offering a comprehensive personal information management solution.

OmniOutliner is a powerful commercial outlining and information structuring application designed for macOS. It enables users to organize ideas, tasks, notes, and projects in a flexible, hierarchical format.

GTDNext is a web-based task management application designed for individuals and teams, focusing on the Getting Things Done (GTD) methodology. It offers a unique hierarchical structure, allowing users to break down complex projects into manageable steps, and includes features like recurring tasks, dependencies, and integrations to streamline workflows.

OpenProject is a powerful, web-based open-source project management software designed for teams of all sizes. It offers comprehensive tools for managing projects, tasks, teams, and communication in one centralized platform. Ideal for organizations prioritizing collaboration, flexibility, and data control.

Nitro was a free, open-source task management application designed to help users organize their daily tasks and boost productivity. It featured a clean interface and supported various integrations for a streamlined workflow.

Tasque is a free and open-source task management application designed for simplicity and efficiency. It helps users organize tasks, manage to-do lists, and optionally track time.

KMail is a powerful and flexible email client tightly integrated with the Kontact personal information manager suite. Part of the KDE ecosystem, it offers robust features for managing your email, including strong encryption options, support for multiple protocols like IMAP, POP3, and Exchange, and seamless integration with other Kontact components like the calendar and address book.

Open365 is a comprehensive, open-source productivity suite offering cloud storage, office applications, and communication tools. Built upon a foundation of open-source technologies like KDE, Seafile, and LibreOffice, it provides a robust alternative to proprietary solutions, emphasizing privacy and control.

Conqu is a versatile task management application designed to help users organize their tasks, projects, and notes effectively. It offers a robust feature set including cloud sync, hierarchical task structures, integrations with popular services, and tools for both individual productivity and team collaboration.

Polymail is an advanced email client for macOS and iOS, built to enhance productivity for professionals using Gmail. It goes beyond basic email functions with robust features like email tracking, scheduling, and team collaboration tools, all wrapped in a sleek and intuitive interface.

<p>MailMate is a powerful, keyboard-centric IMAP email client for macOS designed for users who demand advanced email management capabilities and a highly customizable workflow, featuring strong Markdown integration and robust search features.</p>

Buckets.co is a versatile workflow optimization and collaboration platform designed to enhance productivity across all levels of an organization. It leverages Kanban boards, robust task management, and real-time collaboration features to streamline projects and boost team performance.