Apps with 'Syntax Highlighting' feature

Code combines the streamlined UI of a modern editor with rich code assistance and navigation, and an integrated debugging experience – without the need for a full IDE.

Extensible, cross-platform text editor with a rich ecosystem of plugins and themes.

Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features.

Vim ("Vi IMproved") is an advanced text editor that allows syntax highlighting, word completion and has a huge amount of contributed content. It also has a GUI version called GVim.

An open source note taking and to-do application with synchronisation capabilities.

a markdown editor, markdown reader.

With so many tools, it's hard to keep everyone on the same page. Notion is a new tool that unifies them all.

Open-source, Python-based visual diff and merge tool for comparing files and folders.

Brackets is an open-source editor for web design and development built on top of web technologies such as HTML, CSS and JavaScript.

Geany is a small and lightweight Integrated Development Environment. It was developed to provide a small and fast IDE, which has only a few dependencies from other packages.

Development Environment, Tooling Platform and Application Framework.

Official text editor of the GNOME desktop environment. Has syntax highlighting and is suitable for programming, with support for several languages. It is extensible with plugins.

A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited Variables,

GNU Emacs is an extensible, customizable text editor—and more.