Holiline Reminder 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.

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.

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.

Rainlendar is a highly customizable calendar application for Windows, macOS, and Linux. It seamlessly integrates with popular online calendars like Google Calendar and Fantastical, offering comprehensive event and task management directly on your desktop.

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.

TickTick is a powerful cross-platform to-do list and task management application designed to help individuals and teams organize tasks, manage time, and track habits effectively. With robust syncing capabilities and integrations, it streamlines productivity across various devices.

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.

2Do is a powerful and flexible task management application offering a unique approach to organizing your life. With a focus on simplicity and customization, it provides tools for everything from quick notes to complex project management.

Taskwarrior is a powerful, open-source command-line task management tool designed for serious productivity enthusiasts. It provides a highly configurable and efficient way to track, prioritize, and manage your tasks directly from the terminal, supporting complex workflows like GTD.

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.

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.

Nozbe is a robust task and project management application designed to help individuals and teams implement the Getting Things Done (GTD) methodology for enhanced productivity and collaboration. It offers a flexible environment for managing tasks, projects, and time effectively.

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.