Open-source, cross platform Qt based IDE for reverse-engineering
Open-source, cross-platform Qt based IDE for reverse-engineering Android application packages. It features a friendly IDE-like layout including code editor with syntax highlighting support for *.smali code files. If you are just willing to quickly decompile an Android app, you can make use of DeAPK - Online APK Decompiler which lets you decompile an Android app using apktool and jadx.
QuillTex is a cross-platform native application tiling management tool written in Qt4. An emphasis is made on making all major components a separate dynamic library, for modularity.
Nerdit is an application designed for fast and efficient web page edition. Current version includes: syntax highlighting, search/replace operations, undo/redo, text-bookmarks, php syntax hints, built-in filemanager.
KEncoder is a C++ IDE for KDE that utilizes code generation aiding the novice to intermediate application developers to quickly create apps. It contains project support for KDE and Qt-only applications.