Mac OS X Softwares to Periodic reminders

ActiveInbox transforms your Gmail inbox into a powerful task manager, helping you prioritize emails, manage projects, and achieve Inbox Zero with a Getting Things Done (GTD) approach directly within your familiar email environment.

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.

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.

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.