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Flowchart.js draws SVG flowcharts from a text code definition parsed with flowchart.parse and rendered via drawSVG. Diagrams require JavaScript and use the Raphaël library. It supports symbol types including start, end, operation, subroutine, condition, inputoutput and parallel, and accepts options for styling and flow states.
FlowerShow is a no-code platform that converts markdown files into hosted websites. It supports use cases including digital gardens, blogs, wikis, and documentation sites. Key features include backlink mapping, interactive knowledge graphs, automatically linked searchable wikis, sidebar navigation and full-text search for documentation, password protection, and comment functionality. The service natively supports CommonMark, GFM, Obsidian wikilinks, Mermaid diagrams, and LaTeX math, and is free to use with no credit card required.
GuitarScale.org is a website that presents music scales for guitar and bass guitar through diagrams and supplementary information. Scales are shown in octave-based, shape-based and full fretboard diagram styles, with collapsible panels covering scale degrees, related chords and theory. The site states it shows no ads and offers ebooks for support.
Heimer is a simple cross-platform tool for creating mind maps, diagrams, and taking notes. It is built using the Qt framework, and its source code is hosted in a public GitHub repository under the juzzlin/Heimer namespace.
Iceberg chart creator for building layered topic diagrams, memes, and visual explainers.
Interview Solver is a technical interview preparation platform and AI copilot for software engineering candidates. Its native desktop application for macOS and Windows provides real-time, screen-sharing-invisible assistance during live coding interviews, including LeetCode-style problem solutions, system design diagrams, voice transcription, and answers tailored to a user's resume or job description.
LibreOffice is a free, open source office suite developed by a community and a project of The Document Foundation. It includes six tools: Writer for word processing, Calc for spreadsheets, Impress for presentations, Draw for diagrams and 3D illustrations, Base for databases, and Math for formulas. The project offers no-cost downloads and community assistance rather than technical support from the foundation.
Markdown Editor Online is a browser-based tool for writing Markdown with a real-time preview pane. It supports LaTeX math, Mermaid diagrams, GitHub-flavored Markdown, tables and code highlighting, and allows exporting to PDF, Word or HTML without login. Drafts autosave in the browser, and existing .md files can be uploaded for editing.
Markpad is a markdown viewer and editor for Windows, macOS, and Linux, described as a tabbed Notepad alternative. It offers a GFM preview with syntax highlighting, KaTeX math, Mermaid diagrams, and an embedded Monaco editor with Vim keybindings. It is free and open source and is described as having zero telemetry.
MetaReview is a free, open-source online meta-analysis tool that combines PubMed literature search, AI screening and data extraction, effect-size calculation for OR/RR/HR/MD/SMD, forest and funnel plots, subgroup and sensitivity analysis, PRISMA flow diagrams and report export. It runs in the browser without R, Stata or RevMan. A comparison page states the tool is free.
MolView is a chemistry web tool for sketching and viewing small molecules, with live 3D synchronization while sketching and multiple structures side by side. It includes Lewis structures, reaction diagrams, spectroscopy data, crystallography loading, protein viewing and calculations such as MEP surfaces and energy minimization. A new version has been developed since 2024, while an older app remains available.
Napkin AI is a tool that turns pasted text into visuals such as flowcharts, mind maps, infographics, diagrams, data charts and slides, without design skills. Users generate visuals from their text, then adjust colors and elements. Visuals can be exported as .ppt, .png, .pdf or .svg. A free plan offers 500 AI credits per week, and pricing lists Plus at $9 per person per month.
Nivo is a library of React data visualization components built on top of D3 and React. It provides a range of dataviz components including chord diagrams, line charts, bar charts, pie charts, choropleth maps and other visualization types.
NoteDiscovery is a self-hosted Markdown knowledge base described as free and open source. It includes wikilinks, graph view, a drawing editor, LaTeX math, and Mermaid diagrams, along with AI assistant integration via MCP. Notes are stored as plain Markdown files in folders, and the project offers a Docker-based setup.
Pleco is a Chinese language reference and learning app for iPhone, iPad, and Android. It offers OCR lookup, handwriting lookup, licensed dictionary databases, audio recordings, flashcards, a document reader, a screen reader for Android, and animated stroke order diagrams.
Red Blob Games publishes interactive visual explanations of math and algorithms, using examples from computer games and other projects. Topics include pathfinding, map generation from noise, hexagonal grids, Voronoi diagrams, graph theory and 2D visibility. Articles are free, with no signup and no ads, aimed mainly at independent, student and hobbyist software developers. The site also hosts demos such as map generators.
Slidev is an MIT-licensed project for creating presentation slides aimed at developers. Slides are written in Markdown, with built-in code highlighting, live coding, themes shared as npm packages, and an integrated editor or VS Code extension. It supports LaTeX math, Mermaid diagrams, drawing and annotation, presenter mode, and recording, and exports to PDF, PNGs, or PPTX.
TextUSM is a web-based diagram editor that generates diagrams from indented text without leaving the keyboard. It supports diagram types including User Story Map, Business Model Canvas, Mind Map, Gantt Chart and Sequence Diagram, with export formats such as SVG, PNG and PDF. It is also available as a VSCode extension and CLI tool.
Free WYSIWYG editor for TikZ diagrams in LaTeX. Users drag diagram elements and the corresponding TikZ code updates instantly without disrupting existing formatting. The tool works as a web application or a desktop app.
A curated list of tools and programs for developers, devops, admins, and others, organized into categories such as architecture and diagrams, API development, and backup and archiving. Most listed items are open source, though not all, and the page advises checking applicable licences. The project is hosted on GitHub.
Generate mind maps, flowcharts, sequence diagrams, and more from a simple text prompt with Whimsical AI. Get started for free.
Yandex Images is an image search service operated by Yandex. It enables users to search for a range of image content including postcards, desktop screensavers, funny pictures, diagrams, and illustrated manuals, and allows users to get visual answers to their questions.
