ConTEXT Editor
ConTEXT is small, fast and powerful text editor for software developers. Unlimited open files, unlimited editing file size length, powerful syntax highlighting for C/C++, Delphi/Pascal, 80x86 assembler, Java, Java Script, Visual Basic, Perl/CGI, HTML, SQL, Python, PHP, Tcl/Tk, user definable syntax highlighter, project workspaces, compiler integration, multi-language support and many more features.
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Maqetta
Maqetta is an open source project that provides WYSIWYG visual authoring of HTML5 user interfaces. The Maqetta application itself is authored in HTML, and therefore runs in the browser without requiring additional plugins or downloads. Maqetta is available under a commercial-friendly open source license. You can download the source code and install it on your own server, customize the code to fit your needs and/or contribute improvements to the open source project. The HTML pages created by Maqetta typically work across all popular browsers, including IE (caveat: this depends on the JavaScript toolkit you use and coding details). But if you want to run the Maqetta application, you'll need to use a recent release of one of the following browsers, all of which support the HTML5 features that Maqetta requires. The project's code is built using 100% open standards technologies.
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Geany
Geany is a powerful, stable and lightweight programmer's text editor that provides tons of useful features without bogging down your workflow. It runs on Linux, Windows and MacOS is translated into over 40 languages, and has built-in support for more than 50 programming languages. One the primary reasons for Geany's existence is that there is a need for a decent, GUI, lightweight, cross-platform, flexible and powerful IDE/editor. Many editors meet one or more of these requirements but fall short on others. Using the GPL v2 license, Geany assures that not only can you customize and hack it, but that everyone benefits from changes the community makes. Many parts of Geany are heavily customizable like color themes (Geany Themes) or adding new filetypes. Furthermore, Geany provides many settings to let you adjust it to your needs and preferences. Many supported filetypes including popular programming languages like C, Java, PHP, HTML, JavaScript, etc.
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CotEditor
CotEditor is exactly made for macOS. It looks and behaves just as macOS applications should. CotEditor launches so quick that you can write your text immediately when you want to. CotEditor is developed as an open-source project that allows anyone to contribute. Colorize more than 50 pre-installed major languages like HTML, PHP, Python, Ruby or Markdown. You can also create your own settings. Split a window into multiple panes to see different parts of your document at the same time. Inspect Unicode character data of each selected character in your document and display them in a popover. There are no complex configuration files that require geek knowledge. You can access all your settings including syntax definitions and themes from a standard preferences window. You don't need to lose your unsaved data anymore. CotEditor backups your documents automatically while editing. Check and list-up the characters in your document that cannot convert into the desired encoding.
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