Reindeer is a C library for the rendering of virtual scenes, mainly in three dimensions. The library dynamically loads backend modules to do the rendering. Currently there is only a backend for OpenGL, but ideas for future backends are a raytracer and perhaps Direct3D. Any number of rendering contexts can live at the same time. Contexts are tied to a backend, and backends are automatically loaded and unloaded on demand. Resources are defined globally and can be used by any number of contexts at the same time, even in different backends. The main goal is to make it easier for developers to write applications that have many rendering contexts with shared resources and automatic state management. Another advantage is that the user can choose in which way a scene should be rendered without recompiling the application. For example, a scene could be rendered with a rasterizer like OpenGL at one point, and with a raytracer at another. Reindeer can also be used to get portable graphics output. Reindeer is not a scene-graph library or a game engine, but it can be used to implement them. It's still up to the application to create and manage the native contexts that the Reindeer backends can work on. For example, an application would still need to use GLX or equivalent to be able to use the OpenGL backend. The Reindeer project also provides a package called GTK-Reindeer that makes this easier for developers of GTK+ applications.
Vocab Builder is a collection of two separate programs. The client is the testing application that uses a drill-style method of building your vocabulary in a foreign language, similar to using flash-cards. The editor allows you to create a new, or modify an existing, database for your own personal use. Since the design of the project allows a user to create their own databases/tests, they can not only focus on the words they want/need to learn, but also are not restricted by availability of choice. No more are you restricted by only the databases available to you. Many language teaching applications only allow you to learn the languages they've supplied you. Most North American-based programs cater to English speaking users and only give you a selection of other languages to choose from. Not only can Vocab Builder use any language combination of Native and Secondary languages but it's also open-ended. You can share your tests with others. You can expand the database of words in any direction you want. Word lists are meant to be broken down into categories like colors, sizes, numbers, etc.