A "hierarchical spreadsheet" that is a great replacement for spreadsheets, mind mappers, outliners, PIMs, text editors and small databases.




EssentialPIM is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is TreeSheets, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to EssentialPIM and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to EssentialPIM are Evolution, Org mode, ClickUp and Zenkit.
A "hierarchical spreadsheet" that is a great replacement for spreadsheets, mind mappers, outliners, PIMs, text editors and small databases.




Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.




Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.




All-in-one system integrates project, task, and time management with customizable modular dashboards, collaborative image annotation, multiple task views, and granular workflow customization for teams of any size or industry, streamlining complex to simple projects.




Zenkit is a hyper-flexible SaaS platform for managing projects, databases, and more. Use Kanban boards, tables, or custom views to organize tasks, track data, and collaborate with your team. Build a CRM, financial planner, or simply plan your day—all in one intuitive workspace.




RedNotebook is a graphical diary and journal helping you keep track of notes and thoughts. It includes a calendar navigation, customizable templates, export functionality and word clouds. You can also format, tag and search your entries.




sleek is an open-source (FOSS) todo manager based on the todo.txt syntax. It's available for Windows, MacOS and Linux.




A complete Getting Things Done (GTD) productivity system for desktop and mobile. Mind Like Water.




Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It is designed for composite tasks, and also offers effort tracking, categories, notes and more.




AI-enhanced productivity platform offering a unified workspace for real-time collaboration with document chat, project studio, customizable AI agents, and AI File Chat. Powered by OpenAI's GPT-4 API and ChatGPT, users achieve seamless syncing, utilize AI commands for instant answers, and design custom workflows.




Organize tasks with todo.txt specification support, including parsing, creating, and editing lists. Features built-in help, search, filtering, and compatibility with open plain text files, making it accessible for newcomers seeking an easy task manager.


Modern open-source email client supporting unified inbox, IMAP/SMTP, Gmail and Outlook with OAuth2, conversation threading, rich text TipTap composing, CardDAV contact sync, tracking removal, dark mode, color themes, vim-style shortcuts, and a detachable window.

ClickUp is for teams. It is not a Personal Information Manager.