Markd.ly
Write in plain markdown and export it as the document you meant. The people you send it to get a polished PDF, Word file or web page. Editor, preview and split views on every device, with Mermaid diagrams and LaTeX math rendering as you type, even offline. On the desktop: HTML, PDF, Word, EPUB, LaTeX and slide export, your own CSS, snippets, vim mode, encrypted documents and folder search. Native, not Electron. One $19.99 purchase unlocks every platform.
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Notula
Notula is a free WYSIWYG Markdown editor for the docs as code already in your git repository. It opens the repo as a tree of documents and edits them with no syntax on screen - no hashes, no asterisks, no table pipes, not even on the line the cursor is on - then adds the review layer a code editor has no answer for: comment on a passage, reply, mention someone, suggest an edit, resolve. A mention arrives as a notification and waits in an inbox.
Threads are committed beside the document as plain files. Nothing is written into the Markdown, and a one-word edit stays a one-word diff. Tables are edited as tables and Mermaid blocks are drawn as diagrams. It drives the git already on the machine, and never rewrites history, stages the whole worktree or switches a branch.
Free, no account, no server. macOS and Windows, no Linux build yet. The source is closed and the builds are not code-signed yet, so the first launch takes one extra step.
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Arialine
Arialine is an AI diagram generator and Mermaid diagram editor built for engineering and product teams working in Slack. Create flowcharts, architecture diagrams, sequence diagrams, UML, ERD, C4, swimlanes and other technical diagrams from plain language, Slack discussions, or Mermaid code. Paste valid Mermaid with /arialine and it renders without AI or usage limits. Diagrams stay editable in their Slack thread: reply to make changes, with every accepted edit saved as a version linked to the source message. Arialine includes history, undo, rewind, branching, decision context, PNG/SVG/PDF/.mmd exports, interactive HTML diagrams, Markdown-to-Slack-Canvas rendering, Mermaid 12 + ZenUML support, and an MCP server for Slack AI. It works on every Slack plan, including Free.
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Mermaid
Mermaid is an AI-powered diagramming and visual collaboration platform that enables users to create flowcharts, system architecture diagrams, timelines, and other visualizations using natural language, code, or a graphical editor. The software transforms text prompts, uploaded documents, meeting transcripts, and code snippets into editable diagrams. Its AI assistant supports conversational diagram generation, diagram modifications, and recommendations for selecting appropriate visualization types. Users can create sequence diagrams, Gantt charts, entity relationship diagrams, mind maps, organizational charts, and other technical or business visualizations using Mermaid syntax. The platform provides real-time collaboration, shared workspaces, visual editing tools, diagram presentations, and integrations with developer and productivity applications. Mermaid also supports Model Context Protocol (MCP) integrations, version-controlled diagrams, single sign-on, and more.
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