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.
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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.
Mastofeed provides embeddable Mastodon feeds for blogs and similar pages. Users add HTML markup to display a live preview, and profile owners can opt out or override the #nobot tag with #noMastofeed or #mastofeed.
Matcha is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
material-ui-dropzone is a React component built on Material-UI and the react-dropzone library. It provides a file-upload dropzone or a dropzone inside a dialog, with effects for allowed and disallowed files, previews and alerts. It is installed via npm or yarn and released under the MIT license.
Maulvi is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
MC Musiceditor is free, open source (GPLv2 or above) music notation software made for Windows XP and above, developed by Reinier Maliepaard. It uses a modification of the ABC language, supports note and chord entry, score preview and MIDI playback, and exports to MIDI and PDF. The software is donateware and still maintained.
Metadata Remover is a browser-based tool that removes EXIF, GPS, PDF, Office, EPUB and MP3 ID3 metadata from files. The cleaning engine runs locally in the browser using Rust compiled to WebAssembly, so files are not uploaded. Cleaned files are re-scanned before download.
Metadata Remover is a browser-based tool that removes metadata from image, audio, video, document and ebook files. It runs entirely in the browser with WebAssembly, processes files locally and never uploads them, and supports formats including JPEG, PNG, WebP, PDF, DOCX and EPUB.
Metadata2Go is an online metadata viewer that displays hidden metadata for audio, video, document, ebook and image files. It provides an online EXIF data viewer with no installation required, and also offers metadata removal and metadata editing tools.
Meta Tags is a tool for editing and experimenting with page metadata, then previewing how a webpage will appear on Google, Facebook, X and more. The site also links to official debuggers for Facebook, X, LinkedIn and structured data.
MindForger is a desktop application for Linux presented as a thinking notebook and Markdown editor for personal knowledge management. It stores notes in Markdown, computes associations between notes locally, and automatically turns notebook and note names in text into links in the preview. It is also available for other platforms through packages listed in its installation documentation.
Minetrim is a Minecraft armor trim generator that lets users choose armor, trim patterns, materials and colors to preview trim combinations before building them in-game. The site also includes a background color tool and a reference section covering armor trims and their Smithing Template locations.
MiniMessage Viewer, also called Adventure WebUI, is a web interface for generating and editing MiniMessage strings. It previews text in formats such as chat messages, lore, holograms and server list entries, and can export text to JSON or provide an in-game preview. Short links expire after 6 months.
MixDrop is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
Mockup World is a link directory that handpicks and presents photorealistic Photoshop mockups published online. Listings include a preview image or gallery, a description and a link to the download page. The mockups are layered PSD files with smart objects for placing custom content. The directory states it is free and lists images usable for private and commercial purposes without restrictions.
MonsterWriter is an academic writing tool for students and researchers. It offers two document types: a LaTeX Workspace with a full code editor, syntax highlighting and real-time PDF preview, and a distraction-free Documents mode without LaTeX. It handles formatting, citations and numbering automatically, with citation from DOI, ISBN or URL and export in styles including APA and IEEE.
Motrix Next is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
muCommander is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
A web-based tool for planning multi-monitor setups. It calculates PPI and other screen calculations, previews custom desktop wallpapers, and lets users drag and rearrange monitors to try different layouts. It also offers monitor search, saved setups, shareable links and community-submitted setups.
MultiUp.io is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
MyPhoneExplorer is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
NahrajSoubor is a file utility for storage, cleanup, downloads, syncing, previews, or file management.
Name-Reaction.com presents organic chemistry reactions with detailed, step-by-step mechanisms. Each step is shown without shortcuts, with colour-coded lone pairs and reaction arrows. Hovering over a reaction name gives a schematic preview of reagents, conditions and products, and references are retrieved from science journal databases in ACS style with links to article titles and DOIs.