Fl_Highlight_Editor is a drop in replacement for the FLTK default editing widget, with the ability to highlight and modify text with an embedded scripting language. The widget is fully self-contained and it doesn't depend on anything except the FLTK library, making it suitable for embedding inside an existing project.
Masna provides a simple graphical interface (GUI) to manage Nautilus scripts. For scripts that are part of the system-wide Nautilus script collection (by default /usr/share/nautilus-scripts; you can change this in the settings dialog of Masna), it manages symlinks in the user’s Nautilus script folder. For scripts in the user’s Nautilus script folder, it manages the file permissions.
Valentina Studio is a GUI manager for local files of Valentina DB, SQLite, MySQL, PostgreSQL, and Valentina DB Server. It can edit and browse schemas and records, do SQL queries using a smart SQL editor with autocompletion, export/import into different formats, do SQL dumps, and draw diagrams using reverse engineering.
MW is a low footprint embedded UI framework core intended for use on very limited systems. It embeds the JPEG, Freetype, and Cairo libraries, so it only depends on X. It should be fairly portable, as the only thing you need is to create a window on every platform and manage the events.
CroosUI RAD Desktop is a rapid application development tool that makes it possible for developers to quickly develop and package exactly same code and UI into Web apps, native desktop apps for Windows, Mac OS X, Linux, and UNIX on 32-bit and 64-bit architectures, and mobile apps for iPhone, iPad, Windows Phone, webOS, BlackBerry, and Android devices.
CrossUI RAD Tools enables developers to rapidly develop and package the same code and UI into Web Apps, native desktop apps for Windows, OS X, Linux, and Unix on 32-bit and 64-bit architectures, and mobile apps for iPhone, iPad, Windows Phone, webOS, BlackBerry, and Android devices.
FileRunner is a two-pane file manager for Unix. It is simple and efficient and has a built-in FTP/SFTP/adb client. It does a reasonable (and improving) job on Windows systems. It features a simple and powerful interface, history and Hotlist (bookmarks), a recursive directory menu of the entire filesystem tree, browsing FTP, sFTP, and adb directories as easily as normal directories, asynchronous file transfers, cached directory listings, asynchronous file operations, built-in command shell windows synchronized with file panels, extensibility by adding your own command buttons, and user-defined file pattern/actions.