Glade is a GUI builder for GTK+ and GNOME. It stores projects in an XML format and can generate C code from this meta-format. Additionally, the meta-format can be converted to other languages via modules. For example, glade-- can generate C++ code.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.