Source-highlight-qt is a library for performing syntax highlighting in Qt documents by relying on the GNU Source-Highlight library. It provides an implementation of the Qt abstract class QSyntaxHighlighter class, and it deals both with Qt3 and Qt4, although you will need to build a separate version of the library for the two different Qt framework versions. The Qt3 version has fewer features and it is there only for old Qt applications. Furthermore, the QSyntaxHighlighter class in Qt3 has some design problems which make it quite inefficient to use.
QtitanDataGrid provides a complete set of wide range of unique features that cannot be implemented using default Qt components and methods. It is a pure grid for business application in Qt. It enables you to load various types of data from different sources into a fast, flexible, and functional editable grid supporting sorting, grouping, reporting, creation of banded columns, drag’n’drop for buttons, and plenty of other handy functions. This data grid helps novice and experienced Qt developers with Delphi and C++ backgrounds to use the same comprehensive advanced editable grid capabilities that they’ve grown accustomed to in corresponding IDEs and that are not part of the standard Qt library.