GitHub - AleksandrHovhannisyan/Scribe-Text-Editor: Text editor developed with the Qt framework. Features standard file operations, syntax highlighting, brace autocomplete, and auto-indentation.
Syntax Highlighter Example — Qt for Python
Source-highlight-qt: A library for highlighting Qt documents using GNU Source-highlight.
QCodeEditor - Widget for Qt - CodeProject
Kate: Alternative (pure) C++14 ready syntax highlighting