Calendars & Scheduling tools

Calendar, appointment scheduling, and availability tools.

AppFlowy

Calendars & Scheduling

AppFlowy is an open-source collaborative workspace for organizing projects, tasks, wikis, databases, documentation, and AI-assisted work across devices.

Memos

62,267

Calendars & Scheduling

Memos is a self-hosted, Markdown-native note-taking app for quick capture, timeline-based writing, web clipping, and user-controlled data management.

Plane

56,003

Calendars & Scheduling

Plane is an open-source project management platform for tracking issues, organizing sprints, managing roadmaps, and analyzing project work across teams.

Siyuan

45,825

Calendars & Scheduling

SiYuan is a privacy-first knowledge workspace for block-based notes, linked documents, AI-assisted writing, and structured personal knowledge management.

Logseq

44,466

Calendars & Scheduling

Logseq is an open-source knowledge-management app for organizing notes, tasks, and ideas in local-first graphs, with desktop, web, and mobile access.

Trilium

37,438

Calendars & Scheduling

Trilium is an open-source note-taking application for building large personal knowledge bases with rich editing, search, organization, and self-hosted sync.

Super-productivity

21,376

Calendars & Scheduling

Super Productivity is an open-source task manager for organizing to-dos, timeboxing work, tracking time, building habits, and syncing tasks across devices.

Openproject

15,857

Calendars & Scheduling

OpenProject is open-source project management software for planning portfolios, coordinating tasks, tracking roadmaps, and supporting team collaboration.

Notesnook

14,417

Calendars & Scheduling

Notesnook is an open-source, end-to-end encrypted note-taking app with web, desktop, mobile clients, and a web clipper focused on private note storage.

Vnote

12,897

Calendars & Scheduling

VNote is a free, open-source Qt desktop note-taking application for creating and organizing Markdown notes on Linux, Windows, and macOS systems.

Note-gen

12,636

Calendars & Scheduling

NoteGen is a local-first Markdown app for capturing notes, media, and links, then organizing them with AI into editable documents, searchable knowledge.

Leantime

11,356

Calendars & Scheduling

Leantime is an open-source project management system combining goals, planning, task execution, timelines, dashboards, and team collaboration in one workspace.

Blinko

10,872

Calendars & Scheduling

Blinko is a self-hosted AI note-taking app for quickly capturing ideas as Markdown text, organizing them, and retrieving them with natural-language search.

Kanboard

9,797

Calendars & Scheduling

Kanboard is self-hostable project management software centered on Kanban boards, helping teams organize and track work through visual project workflows.

Kaneo

8,318

Calendars & Scheduling

Kaneo is an open-source, self-hosted project management platform for organizing tasks, issues, projects, and labels in a focused team workspace.

App

6,583

Calendars & Scheduling

Standard Notes is an encrypted cross-platform note-taking app for capturing and syncing private notes and files across devices, with self-hosting support.

Silverbullet

5,854

Calendars & Scheduling

SilverBullet is a self-hosted Markdown knowledge database with wiki links, live preview, queries, tasks, and Lua scripting for programmable personal notes.

QOwnNotes

5,841

Calendars & Scheduling

QOwnNotes is an open-source Markdown notepad and todo-list manager for desktop users, with searchable plain-text notes, tagging, web capture, and cloud sync.

Planify

5,582

Calendars & Scheduling

Planify is an open-source GNOME task manager for organizing, scheduling, and completing to-dos with reminders, calendars, analytics, and cloud synchronization.

Dootask

5,548

Calendars & Scheduling

DooTask is an open-source online project and task management platform with collaboration, documents, messaging, diagrams, file management, and self-hosted.

Tagspaces

5,236

Calendars & Scheduling

TagSpaces is an open-source desktop app for organizing local files with tags, fuzzy search, offline note creation, web clipping, and cross-platform file access.

Vikunja

5,069

Calendars & Scheduling

Vikunja is a self-hostable task and project management platform for organizing work, with hosted and locally deployable options for individuals and teams.

Tududi

3,252

Calendars & Scheduling

Tududi is a self-hosted productivity app for organizing tasks, projects, notes, areas, and tags, with recurring work, sharing, Telegram, and CalDAV support.

Flatnotes

3,179

Calendars & Scheduling

Flatnotes is a self-hosted web note-taking app that stores notes as Markdown files, with tagging, full-text search, editing, linking, and responsive access.

Worklenz

3,147

Calendars & Scheduling

Worklenz is an open-source project management platform for planning projects, tracking tasks, scheduling resources, collaborating, and monitoring delivery with.

NoteDiscovery

2,746

Calendars & Scheduling

Self-hosted knowledge-base app for writing, organizing, searching, and linking Markdown notes with themes, templates, graph views, sharing, and AI integration.

Alexandrie

2,326

Calendars & Scheduling

Self-hosted knowledge base for organizing, searching, sharing, and exporting Markdown notes with offline access, team workspaces, and granular permissions.

Tasks.md

2,180

Calendars & Scheduling

Tasks.md is a self-hosted task board that stores cards as Markdown files, organizing work into customizable lanes and tags through a responsive web interface.

Weektodo

2,137

Calendars & Scheduling

WeekToDo is a privacy-focused open-source weekly planner for scheduling tasks and projects with lists, calendars, reminders, and subtasks across desktop and.

Kanri

1,994

Calendars & Scheduling

Kanri is an offline desktop Kanban board for organizing cards, subtasks, due dates, tags, and rich-text details on Windows, macOS, and Linux.

Atomic

1,891

Calendars & Scheduling

Atomic is a self-hosted knowledge base that turns Markdown notes into linked, searchable articles with AI synthesis, semantic search, chat, and visual graph.

Paca

1,723

Calendars & Scheduling

Paca is a self-hosted project management platform where humans and AI agents plan, execute, and review work together on configurable Scrum boards.

Mindwtr

1,677

Calendars & Scheduling

Mindwtr is an open-source GTD task manager for capturing, organizing, scheduling, and completing tasks across desktop, mobile, and web with local-first data.

Deck

1,413

Calendars & Scheduling

Nextcloud Deck is a self-hostable kanban tool for organizing personal and team projects with cards, boards, sharing, notes, labels, and comments.

TaskBoard

1,401

Calendars & Scheduling

TaskBoard is a self-hosted Kanban task manager for organizing work on customizable boards, assigning tasks, tracking due dates, and moving items through stages.

Anchor

1,222

Calendars & Scheduling

Anchor is a self-hostable, offline-first note-taking app for creating, organizing, searching, sharing, and syncing rich multimedia notes across web and mobile.

Edgeever

1,171

Calendars & Scheduling

EdgeEver is an open-source notes workspace for capturing, organizing, searching, syncing, and sharing rich notes across devices with AI and web clipping.

Lotti

1,162

Calendars & Scheduling

Lotti is a private, local-first work logbook for tasks, time records, journal entries, habits, and health data, with optional AI assistance and encrypted.

Crossnote-app

1,087

Calendars & Scheduling

Crossnote is a local-first web notebook for writing and reading Markdown notes stored in the browser or local folders, with offline use and Git sync.

Rote

1,031

Calendars & Scheduling

Rote is a self-hostable note platform for recording, organizing, exporting, and searching notes and Markdown articles, with optional AI chat and an iOS client.

Notabase

910

Calendars & Scheduling

Notabase is an open-source personal knowledge base for linking, organizing, editing, searching, and browsing notes across devices with cloud sync.

Lumina-Note

907

Calendars & Scheduling

Lumina Note is a local-first Markdown desktop note app with linked knowledge graphs, PDF tools, and an AI agent for organizing and enriching vaults.

Eclaire

897

Calendars & Scheduling

Eclaire is a local-first, self-hosted AI workspace for organizing notes, documents, photos, bookmarks, and tasks with private data processing.

4gaBoards

689

Calendars & Scheduling

4ga Boards is a self-hostable web platform for realtime kanban project management, organizing projects, boards, lists, cards, and tasks with team collaboration.

Memex

669

Calendars & Scheduling

Memex is a local-first iOS and Android journal that captures text, photos, and voice, then uses AI to organize fragments into cards, knowledge, and insights.

Kanba

642

Calendars & Scheduling

Kanba is an open-source project-management platform for organizing projects, boards, lists, and team collaboration, with a lightweight workflow for makers and.

Scrumboy

429

Calendars & Scheduling

Scrumboy is a self-hosted project management app with Kanban boards, issue tracking, sprints, workflows, collaboration, voice commands, and automation.

SilentNotes

340

Calendars & Scheduling

SilentNotes is a privacy-focused note-taking app for Android and Windows with encrypted synchronization, tagging, search, WYSIWYG editing, and self-hosted sync.

Ticky

289

Calendars & Scheduling

Ticky is an open-source Kanban task-management system for organizing projects with shared boards, cards, deadlines, subtasks, collaboration, and tracking.

Taskwarrior-flutter

244

Calendars & Scheduling

A Flutter mobile task-management app for creating, filtering, and completing Taskwarrior tasks, with optional synchronization across devices through TaskServer.

How to choose open-source Calendars & Scheduling software

Start with the workflow you need to replace, then compare feature coverage, deployment documentation, project activity, data portability, and support. Repository popularity is useful context, but it should not outweigh fit or the project's maintenance history.

Capabilities and use cases

Across the reviewed tools, common documented capabilities include Cross-device multimedia note capture and retrieval, Advanced and AI-powered search, Notebooks, tags, and templates, Connected note vault creation, Local data storage, Project organization, Graph and full-text search, Natural-language task lists from capture to completion. Verify the exact workflow on each profile before migrating production data.

Licensing considerations

Licenses represented in this category include AGPL-3.0, Apache-2.0, GPL-2.0, GPL-3.0, LGPL-3.0, MIT, MPL-2.0. Check redistribution, modification, and hosted-service obligations against your intended use.

Self-hosting tradeoffs

50 of 50 reviewed tools are confirmed as self-hostable, and 33 document Docker support. Compare upgrade, backup, monitoring, and security work alongside hosting cost.

Related software categories

Task Management Document Collaboration Project Management Note Taking Knowledge Management Workflow Automation