FastFormat is a C/C++ output and formatting library whose design parameters are complete type-safety, efficiency, genericity, and extensibility. It is simple to use and extend, highly portable (to any platform or compiler), and it upholds the C tradition of you only pay for what you use. FastFormat supports output and formatting of statements of arbitrary complexity, consisting of heterogeneous types. FastFormat writes to output "sinks", which can be of arbitrary type.
Intlize allows the developer to use catgets without its normally bulky syntax and without having to mind the details of correct indices. Catgets is the built-in internationalization suite of C compilers. Alternatively, Intlize can produce a compact file format optimized for fast access. Intermediate files are in gettext po format, so there are many comfortable tools available to do the translations. Runtime files are provided for C and C++ and for both catgets and intlize native support.
rxvt-unicode is a clone of the well known terminal emulator rxvt, modified to store text in Unicode and to use locale-correct input and output. It also supports mixing multiple fonts at the same time, including Xft fonts, real transparency, and an optional embedded Perl interpreter that allows you to extend your terminal easily.
LGI is a lightweight GUI library and application framework. It supports cross-platform widgets, threads, Unicode, a multi-language resource file in XML (with graphical editor), drag and drop, common dialogs, network support with implementations of common protocols, and an HTML control.