OObsidian

SiYuan is an open-source, privacy-first knowledge-management system built around block-level references, two-way links, Markdown WYSIWYG editing, and large documents. Users can create and organize notes, query content with SQL embeds, clip web content, annotate PDFs, and create tables, charts, flowcharts, and other embedded content.

The software includes AI writing and question-and-answer chat through the OpenAI API, templates, flashcards, OCR, export to Markdown, PDF, Word, and HTML, and multi-tab split-screen editing. It is available as desktop and mobile applications and can also be deployed through Docker or Docker Compose, with browser access to a server-hosted workspace.

Logseq is a privacy-first, open-source knowledge-management and collaboration application centered on structured notes and graphs. It supports Markdown and Org-mode files, task management, PDF annotation, plugins, themes, and organization of ideas and notes. The README also documents collaboration, mobile access, and a database version with graph synchronization through RTC.

Users can download desktop releases, try the web version, or build the application from source. A Linux installer is documented, along with a Docker web-app guide for development. The project is released under the AGPL-3.0 license and provides a plugin API for extending the application.

Trilium Notes is a free, open-source, cross-platform hierarchical note-taking application designed for large personal knowledge bases. Users organize rich WYSIWYG notes in arbitrarily deep trees, place notes in multiple locations, edit tables, images, mathematics, and source code, search full text, version notes, and publish notes publicly.

The application also documents note attributes, scripting, REST automation, encryption, synchronization through a self-hosted sync server, relation and link maps, mind maps, geographic maps, Excalidraw-based canvases, web clipping, and Markdown or Evernote import and export. It provides desktop binaries for Windows, macOS, and Linux, a browser-accessible server interface, mobile web access, and Docker-based server installation.

NoteDiscovery is a lightweight, self-hosted note-taking and knowledge-base application for personal wikis, second brains, privacy-conscious users, and small teams. Users write and organize notes stored as plain Markdown files, then find them through full-text search, tags, favorites, backlinks, an outline panel, and an interactive graph view.

The documented interface includes responsive layouts, themes, templates with dynamic placeholders, drawing support, LaTeX/MathJax, Mermaid diagrams, HTML export, printing, and optional password protection. Its built-in MCP server lets compatible AI assistants search, create, edit, organize, tag, and append to notes. It runs through Docker or Docker Compose, or directly with Python, and stores data on the user's server.

NoteGen is a local-first Markdown application for capturing thoughts, voice recordings, screenshots, images, links, files, and todos before organizing them into structured notes. Users can filter records by tag, time, or type, select related material, apply a template or instruction, and produce summaries, reports, articles, or other Markdown structures for continued editing.

The editor supports visual and source Markdown modes, tables, task lists, code, math, diagrams, search and replace, attachments, export, printing, history, and workspace management. It also provides AI chat and writing assistance, OCR, audio and image capabilities, searchable knowledge bases with semantic and local retrieval, MCP servers, agent tools, and an editable canvas for diagrams, mind maps, timelines, drawings, and charts.

Notes remain ordinary Markdown files in a chosen workspace. The application is local

Standard Notes is an end-to-end encrypted note-taking application for digitalists and professionals. It lets users capture notes and files, keep them in a private account, and synchronize them across unlimited devices. The README emphasizes that only the user can read the encrypted content.

The project provides web, Mac, Windows, Linux, iOS, and Android access, with a documented web app and downloadable clients. Its open-source repository also supports self-hosting: users can build the web app and serve the generated static files locally, while configuring a custom sync server. The documentation additionally describes publishing through the Listed service and extension development.

OpenKnowledge is a WYSIWYG markdown and MDX editor for existing folders, wikis, Obsidian vaults, codebases, knowledge bases, specifications, and notes. It provides file navigation, search, tabs, graph-based wiki-link viewing, embeddable HTML, and rich components for reports and technical documents.

The application integrates side-by-side AI editing with Claude, Codex, OpenCode, Pi, and other harnesses, and includes MCP, skills, and agentic search for LLM wikis and knowledge graphs. Optional team sharing and synchronization use Git and GitHub. It is available as desktop software for macOS, Windows, and Linux, or as a locally run web application installed and started through its CLI.

flatnotes is a distraction-free web note-taking application that stores content as ordinary Markdown files in a flat folder rather than a database. Users can create and edit notes through raw Markdown or WYSIWYG modes, organize them with tags, link notes with Wikilinks, and find content through full-text search.

The app provides a mobile-responsive interface, customizable home page, light and dark themes, multiple authentication options, and a RESTful API. It is designed for user-controlled storage, allowing Markdown files to be added, edited, or deleted outside the application while it runs. Deployment is documented through Docker or Docker Compose, with data mounted from a local directory; hosted deployment through PikaPods is also described.

Alexandrie is an open-source, self-hosted wiki and knowledge-management platform for teams and individuals. Users create and maintain nested documents with an extended Markdown editor supporting LaTeX, custom containers, checkboxes, snippets, speech-to-text, and embedded diagrams. Documents can be organized across teams, workspaces, categories, and hierarchical nodes.

The platform provides full-text search with highlighted results, offline-first PWA access and synchronization, public links, granular workspace and node permissions, integrated Kanban boards, media previews, and ZIP import/export. It supports OIDC single sign-on, automated backup and restore workflows, and S3-compatible storage. Deployment is documented through Docker Compose, with the application available locally at port 8200.

ZenNotes is a keyboard-first Markdown notes application that stores notes as ordinary files in a user-selected vault. Its documented workflows include quick capture, editing, split and preview modes, Vim navigation, folders, tags, search, archive and trash, tasks, daily and weekly notes, diagrams, mathematical notation, and local asset handling.

The product is distributed as an Electron desktop app for macOS, Windows, and Linux, and also provides a self-hosted web app backed by a Go server. Docker deployment is documented with mounted vault and data directories, local authentication, configurable ports, and browser access on a LAN or home server. A command-line companion and MCP server are included for terminal and tool integrations.

TidGi is a cross-platform desktop application for note taking, GTD, and fragment knowledge management. Built on Node.js TiddlyWiki, it supports local wiki workspaces, separated editable tiddler files, backlinks, knowledge graphs, community plugins, and interactive scripts.

The application lets users store data locally or use GitHub as a storage and GitHub Pages blogging platform. It can create local Git repositories, back up wikis, clone online wikis, and deploy a TiddlyWiki blog. Official packages are provided for Windows, macOS, Debian/Ubuntu, and RPM-based Linux distributions, with an official mobile companion.

Atomic is a personal knowledge base built around “atoms,” or Markdown notes that are automatically chunked, embedded, tagged, and linked by semantic similarity. Users can capture content through the desktop app, iOS app, browser extension, RSS feeds, or MCP tools, then search and browse the resulting knowledge graph.

The product includes wiki synthesis with inline citations, scheduled research reports, agentic chat, hierarchical auto-tagging, a spatial canvas, and support for OpenRouter, Ollama, and OpenAI-compatible providers. It runs as a Tauri desktop app, a web frontend with a headless server, or both, and can be deployed locally with Docker Compose, Fly.io, or a standalone server.

Reflect is an open-source note-taking application for Mac and iPhone built around a user-selected folder of Markdown files. It opens to daily notes and supports wiki links, backlinks, tags, local search, browser capture, audio memos with transcription, and optional AI queries that cite source notes.

Notes remain usable outside the application, while the app adds graph-oriented navigation and related-note features. Users can keep content local, exclude private notes from external services, and choose iCloud Drive or Git/GitHub for synchronization and versioned backup. The repository documents downloadable Mac releases, an iOS beta, a Chrome extension, a CLI, and local source builds.

Anchor is an offline-first note-taking application for web and Android. Users can create rich-text notes with formatting, checkboxes, images, and audio attachments; organize them with tags, pinning, archiving, backgrounds, and trash recovery; and search locally by title or content. The application also supports note sharing with viewer or editor access, library import and export, and an Android home-screen widget.

Anchor stores edits locally and synchronizes changes across devices when online. It is designed for self-hosted deployment through Docker Compose, using a bundled or external PostgreSQL database, persistent volumes, and optional OIDC authentication. The repository also provides prebuilt container images and downloadable Android APKs.

EdgeEver is an open-source, Evernote-style notes workspace built around a three-pane interface for capturing and organizing rich notes. It supports text, Markdown, images, PDFs, Office files, archives, audio, and video attachments, nested notebooks, revision history, public sharing, Mermaid diagrams, imports, and ZIP exports containing portable Markdown and attachments.

The product provides web clipping for Chrome, Edge, and Firefox, unlimited synchronization across web, PWA, Android, and macOS, and offline drafts or native-client editing with queued synchronization. AI features support summarization, rewriting, translation, task extraction, and other note operations through configurable model providers; MCP and REST APIs support agent access and organization.

EdgeEver is licensed under AGPL-3.0 and deploys as a Cloudflare Workers application using D1 and R2, with documented multi-user

Notabase is an open-source personal knowledge base designed for networked thinking. Users create and edit notes with a WYSIWYG Markdown-supporting editor, connect notes with links, tags, nested notes, references, and block embeds, then browse relationships through page stacking and graph view. Full-text search, import and export, and linked or unlinked references support retrieval and ongoing organization.

The project provides a hosted experience and documents self-hosting locally with a Next.js build, Supabase authentication, database, and storage. Notes can sync to the cloud and be accessed on any device; the Progressive Web App supports faster loading and offline viewing. The repository is licensed AGPL-3.0.

Lumina Note is an Electron desktop note-taking application for Windows, macOS, and Linux. Users keep notes as human-editable Markdown files in a local vault, with live preview, reading mode, WikiLinks, backlinks, graph views, images, PDFs, annotations, and flashcards.

Its embedded agent can read, write, reorganize, summarize, connect, and research notes across the vault with permission. It can draft pages, summarize PDFs, generate flashcards, and clean up knowledge. AI providers include local Ollama models, OpenAI-compatible endpoints, multiple hosted providers, and optional Lumina Cloud.

Users can install packaged releases or build the Electron app from source. The repository also documents mobile companion apps, a self-hosted relay, and an extension system, but does not document cross-device note synchronization, web clipping, or real-time collaboration as core workflows.

mdSilo is a local-first knowledge base and feed reader for storing ideas, thoughts, and knowledge in local plain-text files without registration. It provides an all-in-one editor supporting Markdown, WYSIWYG editing, mind maps, Mermaid diagrams, tables, mathematical notation, code blocks, and attachments.

The application includes graph, task, chronicle, and full-text search views, along with folders, tags, backlinks, recent history, and Kanban boards for organizing a personal knowledge base. It also supports RSS and Atom feeds, podcasts, exports to PDF or images, and Windows, macOS, Linux, and web builds. The repository documents building the Tauri desktop application from source.

Kuku is an open-source local-first Markdown workspace for macOS. It edits ordinary .md files in a local vault and supports portable personal knowledge workflows, including wiki links, backlinks, search, and 2D or 3D graph navigation.

The application also provides Second Brain workflows, AI Agent, Ask, and Inline modes, file or text attachments, and reviewable proposed edits with diffs. Its encrypted sync foundation covers workspaces, devices, key envelopes, signed commits, and encrypted objects.

The repository includes the macOS client, web app, Go server, protobuf contracts, Rust AI and indexing crates, and Docker infrastructure. Users can download the macOS build, install it through Homebrew, or inspect and self-host the system; Windows and Linux are listed as forthcoming.

GitJournal is a mobile-first note-taking app focused on privacy and data portability. It stores notes as standardized Markdown files with optional YAML headers, and integrates them with a Git repository hosted on GitHub, GitLab, or a custom provider. The README also identifies journaling and knowledge-management use cases.

The app provides mobile applications distributed through Google Play and the Apple App Store, with screenshots documenting its user-facing interface. Its Git-based storage model lets users choose a provider and self-host or host notes through one of the documented Git providers. The supplied evidence does not document task tracking, calendar planning, whiteboards, templates, or API/MCP connections.

Blinko is an open-source, self-hosted personal AI note-taking application focused on quickly capturing fleeting thoughts and ideas. Users can store plain-text notes with full Markdown support, organize their material, and retrieve notes through AI-powered retrieval-augmented generation and natural-language queries.

The project documents multi-platform support through Tauri for macOS, Windows, Android, and Linux, with data kept in the user's self-hosted environment. It provides a Docker-based installation path through an install script and also links to a hosted deployment option through PikaPods. The supplied README does not document web clipping, multimedia note capture, shared editing, tasks, calendar links, or transcription.

Haptic is a local-first, privacy-focused application for writing and managing markdown notes. It is presented as a lightweight open-source home for notes, using a local database and a Tauri desktop application, with a web instance also available.

Users can run the web version through a self-hosted Vercel deployment or Docker container and access it in a browser. The README identifies note synchronization and note sharing as planned roadmap items, so these capabilities are not documented as currently available. The repository is licensed under AGPLv3.

Crossnote is a local-first web application for reading and writing Markdown notes. Notes remain plain Markdown files stored in the user's browser or local folders, rather than being held behind a dedicated server or account. The documented workflow centers on creating, editing, and viewing notebook content in a browser.

The application supports offline operation and direct synchronization with any Git repository through in-browser Git. Its repository describes a privacy-oriented, self-hostable approach, while the current project is being rebuilt after the original backend was shut down. The supplied documentation does not describe multimedia capture, web clipping, advanced search, templates, tasks, calendar links, or collaborative editing.