HTMLPen.com is described as 'HTMLPen is a tool for creating HTML files with visual and code editors and instant previews. It is also a platform to showcase your HTML projects, code, and code samples. It can open very large files (TB+) and do regex searches, counts, and exports' and is a Code Editor in the development category. There are more than 100 alternatives to HTMLPen.com, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and Android apps. The best HTMLPen.com alternative is Visual Studio Code, which is free. Other great sites and apps similar to HTMLPen.com are VSCodium, Kate, Geany and GNU Emacs.
jEdit is a mature programmer's text editor with hundreds (counting the time developing plugins) of person-years of development behind it. jEdit beats many expensive development tools for features and ease of use AND it is released as free software with full source code...
Universal Viewer is an advanced file viewer for wide range of formats. Supported file formats are:
kodeWeave is a realtime coding playground for HTML, CSS and Javascript. Similar to JSFiddle and JSBin, but kodeWeave was made to work offline but also as a prototyping application to build applications for desktop operating systems while on mobile devices.
glogg is a multi-platform GUI application to browse and search through long or complex log files. It is designed with programmers and system administrators in mind. glogg can be seen as a graphical, interactive combination of grep and less.
CSSEdit is a visual cascading style sheet editor built-in Espresso , with CSS3 support for multi-browser gradients, shadows and more.
Utilize an intuitive editor to swiftly craft websites. Enjoy features like W3C-compliant code generation, free templates, multilingual support, SEO, cross-browser compatibility, and a responsive design. Experience full control over editing and customization with reusable elements.
BareTail is a real-time log file monitoring tool.
Features
Real-time file viewing
dabblet is an interactive playground for quickly testing snippets of CSS and HTML code. It uses -prefix-free, so that you won't have to add any prefixes in your CSS code. You can save your work in Github gists, embed it in other websites and share it with others.
WYSIWYG Web Builder generates HTML tags automatically, supports varied designs with over 250 pre-made blocks, and integrates tools for form email, file uploads, and validation. It includes extensions for slideshows, multimedia, ecommerce features, and a one-click publishing tool supporting multiple protocols.
CodeSandbox is an online editor with a focus on creating, sharing and importing new React projects
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