Generation of diagrams and flowcharts from text in a similar manner as markdown.
Amazing Code Editor
a universal document converter
LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation.
SimpleMDE is a simple, embeddable, and beautiful JS markdown editor
CodeMirror is a versatile text editor implemented in JavaScript for the browser. It is specialized for editing code, and comes with a number of language modes and addons that implement more advanced editing functionality.
MD在线编辑器，可以导出/导入，HTML，MD，PDF格式的文件。
Markdown编辑器，桌面应用。
Fake Online REST API for Testing and Prototyping
epochconverter将epoch时间转化为可读时间。
imagemagick Use ImageMagick® to create, edit, compose, or convert digital images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, GIF, WebP, HEIC, SVG, PDF, DPX, EXR and TIFF. ImageMagick can resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.
ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you may use, copy, modify, and distribute in both open and proprietary applications. It is distributed under a derived Apache 2.0 license.
Outgoing port tester
This server listens on all TCP ports, allowing you to test any outbound TCP port.
jq
jq is a lightweight and flexible command-line JSON processor.
curl 'https://api.github.com/repos/stedolan/jq/commits?per_page=5' | jq '.'