libx1f4i0 is a C library that provides some (text) user interface functionality. It includes a sophisticated expression evaluator, a proto application extension programming language interpreter, about one thousand number parsing and formatting primitives, a fancy printf-like text formatter for applications, and miscellaneous trivial conveniences.
Gimp User Filter is a work-alike to Adobe's Filter Factory. It is a generic image processing plug-in that can be used to create new filters for The GIMP without having to go through the process of learning about The GIMP's SDK. Many freely available filters that have been created for Filter Factory can also be used with this plug-in.
xpython is a bundle that includes the Python interpreter and runtime and a number of libraries. It can be compiled into a single binary, thus simplifying software distributions without proper package management. The binary contains Python, wxWindows, SQLite, and a number of useful modules.
Ctalk adds classes, methods, operator overloading, inheritance, and complex object expressions to otherwise standard C programs. Programs can use only a few Ctalk objects and methods in an otherwise standard C program, but the language can be used to write entire programs also. Ctalk works on most if not all of the systems that support GCC, the GNU C compiler. The package includes the language, class and run-time libraries, example programs, tutorial, and language reference.