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.
uim is a multilingual input method framework. It aims to provide a flexible development platform and useful user environment for input methods. It works in many environments, including general desktop systems such as GNOME or KDE, and even in a console. It also supports Linux Zaurus and Mac OS X.
The XView4Struts project is an extension to the Jakarta Struts Framework. Its main purpose is to eliminate the need to use tag libraries and JSP pages. The view is pure HTML, and interaction between the view and the model is transparent to the developer. This approach offers faster development, better division of work, a more pure MVC design pattern, reusable view components, and easier maintenance.
cstrings is a lightweight internationalization tool for C code. It is useful for those who find gettext too bulky and intrusive. It extracts strings from a program, and turns them into #defines in a prepended code section. It has good features for building up your message base incrementally.
I18NEdit manages internationalized properties for Java programs and features a PHP adapter class for them. All property bundles are shown in a tree, and each property is editable directly in all available localisations. I18NEdit keeps track of changes in a source locale and presents the translator only what has been altered since his last translation session. Distributed working groups are supported by merging features.