Open-source Reflect alternatives

AppFlowy is an open-source workspace that brings documents, wikis, project and task management and team collaboration into one app. It is presented as an alternative to Notion, and its topics also tag it as a Confluence alternative, with the emphasis on keeping control of your own data.

The client is built with Flutter and a Rust core, giving apps for macOS, Windows and Linux plus iOS and Android versions. Desktop builds can be downloaded directly or from channels such as Flathub and Snapcraft. AI features are part of the workspace, and a public roadmap and active forum let users propose features. Translations are contributed through JSON files and tools such as inlang.

The project is AGPL-3.0 licensed and has documentation for self-hosting the server side, so organizations can keep content on their own infrastructure. A hosted version is available through appflowy.com for people who do not want to run servers. It suits teams looking for a Notion-style workspace with a privacy-first stance.

SiYuan is an open-source, privacy-first personal knowledge management system. Its distinctive feature is fine-grained, block-level referencing: any block can be linked to or embedded elsewhere, with two-way links, custom attributes and SQL query embeds. Editing is Markdown WYSIWYG, and the project describes itself as a workspace where humans and AI agents work together. It is local-first and self-hostable.

The editor supports block-style writing, list outlines, block zoom-in, very large documents, math formulas, charts, flowcharts and Gantt charts. Web clipping, PDF annotation links, flashcards with spaced repetition, a database table view, Tesseract OCR and multi-tab split-screen layouts are included. You can export blocks and embeds, standard Markdown with assets, or PDF, Word and HTML. AI writing and Q and A chat can use the OpenAI API, and template and JavaScript or CSS snippets allow customization.

SiYuan is AGPL-3.0 licensed and available as desktop apps, mobile apps for Android, iOS and HarmonyOS, an installation package, a package manager, and Docker, Kubernetes, Unraid and TrueNAS hosting. A command line interface and an app market for extensions exist. Most features are free, even for commercial use.

Logseq is an open-source platform for knowledge management and collaboration that puts privacy and local storage first. Notes are organized as linked blocks in an outliner, forming a knowledge graph, and topics show it works with both Markdown and Org-mode files and can be backed by Git.

The project is moving toward a database-backed version that introduces DB graphs. That version is in beta, comes with a new iOS mobile app in alpha and a Real Time Collaboration approach to syncing graphs across devices or working with others, also in alpha. Because data loss is possible while these features mature, the maintainers recommend automated backups. A plugin API, themes and a public roadmap round out the ecosystem.

Logseq is written in Clojure and ClojureScript under the AGPL-3.0 license, and desktop builds are available from the releases page. It appeals to researchers, students and knowledge workers who want a personal wiki with bidirectional links and full ownership of their files.

Trilium Notes is a free, open-source, cross-platform note-taking application focused on building large personal knowledge bases. Notes are arranged in a tree of arbitrary depth, and a single note can be cloned into several places in the tree, which lets you organize the same material along different lines without duplicating it.

The editor is a rich WYSIWYG one with tables, images, math and Markdown autoformatting, and there is also support for source code notes with syntax highlighting. Navigation relies on fast jumps between notes, full-text search and note hoisting. Notes are versioned automatically, and attributes can be used to organize, query and script notes. The interface is available in several languages, and built-in documentation opens with F1.

The project, now maintained as TriliumNext, is AGPL-3.0 licensed and built with TypeScript and Electron. It provides desktop builds as well as a server setup with Docker, so you can keep your notes on your own hardware. Stable releases are recommended, with nightly builds available for those who want the newest changes.

Foam is a personal knowledge management system that lives inside Visual Studio Code and GitHub. It is intended for organizing research, keeping notes you can rediscover, writing long-form content and, if you want, publishing it to the web. The notes are plain Markdown files you own, so you can share and collaborate on them with anyone.

Its features center on linking notes together. A graph visualization shows how notes connect, link autocompletion helps create connections and placeholders, and links are updated automatically when a file is renamed. Foam supports files with the same name in different folders by using the shortest identifier needed, and it helps find and fix ambiguous wikilinks. Link preview, go to definition and peek references let you see where a note is mentioned. Topics include Zettelkasten and PKM workflows.

Foam is a free, open-source VS Code extension written in TypeScript, and its license is listed as 'Other' on GitHub. It requires VS Code, so it suits developers and technical writers already comfortable in that editor who want a notes workflow built on files and Git instead of a separate app.

Anytype Desktop is the official desktop client for Anytype, a personal knowledge base for macOS, Windows and Linux. It lets you collect pages, tasks, wikis and journals and link them together, while keeping data stored locally and encrypted across your devices.

The client is built around composable blocks such as text, databases, kanban boards and calendars, and you can define your own Types to shape the data model. Storage is offline-first with optional peer-to-peer sync, and encryption relies on the any-sync protocol. It is an Electron application written in TypeScript, and it can be extended through a gRPC API and AI agents described in the repository.

Sign-in uses an Any-ID, and installers are published on the releases page and the download site. The code is published under the Any Source Available License 1.0 rather than a standard open-source licence, and the README includes instructions for building from source and updating the middleware.

SilverBullet is a personal knowledge base that runs in the browser and is hosted on your own server. Your content is stored as Markdown pages grouped into a Space, which you can open from a page picker as in a classic notes app, or reach through two-way wiki-style links. The project describes itself with a tongue-in-cheek phrase as a notes app on steroids.

What sets it apart is that notes can be programmed. A live-preview editor is paired with an integrated database and query syntax, and a Lua scripting environment called Space Lua lets you extend the system, build custom views and automate tasks. Repository topics highlight knowledge management, personal knowledge management, note taking and end-user programming.

SilverBullet is written in TypeScript and licensed under MIT. Because it is designed for self-hosting and plain Markdown files, it suits individuals and small teams who want a private, hackable wiki and are comfortable with a little scripting. There is no hosted service from the project.

Inkstone is a browser-based Markdown notebook for writing, organizing, syncing and backing up personal knowledge, and it runs entirely on Cloudflare Workers. Notes are always plain Markdown, and the deployer keeps control of the database, attachments and runtime, making it a complete self-hosted application. New accounts get two starter notes in Chinese and English.

Writing features include a CodeMirror 6 editor, live preview, split layouts, focus and typewriter modes, autosave and version history. Markdown support covers GFM tables, footnotes, wikilinks, embeds, callouts, math, Mermaid diagrams and front matter. Notes can be organized in nested folders with tags, favorites, archive and trash, with backlinks, block references and a relationship graph, and search uses D1 full-text search with optional semantic search powered by Workers AI. A private remote MCP server with OAuth 2.1 and PKCE is included, along with offline editing, multi-device sync, sharing and WebDAV backups.

Inkstone is built with TypeScript, React, Hono and Cloudflare services such as D1, R2, KV and Durable Objects. The README names the licence as LGPL-3.0-only, while repository metadata lists it as other, and a browser-only demo is available. It suits people who already use Cloudflare and want a private note system they own.

mdSilo is a lightweight knowledge base for storing ideas and notes, with a built-in feed reader. It is a local-first desktop app built with React and Tauri that works on top of local plain-text files, with no registration and no privacy concerns about cloud accounts.

The editor combines Markdown, WYSIWYG and mind map modes with diagrams, tables, math, highlighted code blocks, slash commands, a hovering toolbar and export to PDF or PNG. Notes can be explored in chronicle, graph and task views, and a kanban board helps manage a personal knowledge base like a project. The feed reader covers RSS, Atom and podcasts, and full-text search works across content.

Apps are available for Windows, macOS and Linux from the releases page or can be built from source with Rust and Node.js. The editor uses ProseMirror, the project has a roadmap including PDF and epub annotation, and it is licensed under AGPL-3.0.

Tangent is a local note writing and personal knowledge management tool, heavily inspired by Obsidian but developed in its own direction. It uses [[Wiki Links]] and a slightly customized Markdown syntax, and notes are styled as you write, with Markdown syntax hidden and revealed as needed.

Other key features include a two-dimensional connected map of your navigation and linking history, a sliding panel interface inspired by Andy Matuschak's notes, a writing focus mode that highlights the current paragraph, line or sentence, note views that show collections as cards or an infinite feed, and a custom query language with autocomplete for complex searches. Notes can embed images, link previews, PDFs, audio and video, including YouTube links. Pre-built binaries are available from the downloads page and Flathub.

This monorepo holds the Electron-based Tangent application, the source of tangentnotes.com, a test workspace generator, an HTML-to-Markdown parser and the query language parser. Tangent is written in TypeScript and licensed under Apache-2.0.