A directed graph is graph, i.e., a set of objects (called vertices or nodes) that are connected together, where all the edges are directed from one vertex to another. A directed graph is sometimes called a digraph or a directed network.

A function in several scripting languages for packing data, creating a sequence of specifically ordered and aligned bytes, into a binary structure. The opposite of the `unpack` function. This tag should be used with a programming language tag as well. While also used as a directive or pragma in some compilers to cause the compiler to ignore standard variable alignment for data aggregates (i.e. struct), do not use this tag for posts on that subject.

pytz brings the Olson tz database into Python. This library allows accurate and cross platform timezone calculations using Python 2.3 or higher. It also solves the issue of ambiguous times at the end of daylight savings.

POSIX function to dynamically load a library or binary into memory

In theoretical computer science, automata theory is the study of abstract 'mathematical' machines or systems and the computational problems that can be solved using these machines. These abstract machines are called automata. ("Automata", Wikipedia)

NSOutlineView is a subclass of NSTableView that uses a row-and-column format to display hierarchical data that can be expanded and collapsed, such as directories and files in a file system. A user can expand and collapse rows, edit values, and resize and rearrange columns.

grepl is an R function that searches for matches to argument pattern within each element of a character vector.

The jQuery UI Droppable plugin makes selected elements droppable so they accept being dropped on by draggables.

App Inventor is a graphical programming environment for making Android apps, originally developed by Google and now run by MIT as an open source project. The programming is done in a graphical way with blocks like jigsaw pieces similar to scratch or snap.

DirectX 9 is the 9th version of Microsoft's DirectX API, which is used to develop and handle tasks related to Multimedia, such as game programming, 3d visualizations and video on Microsoft platforms including Windows XP, Windows Server 2003, and Xbox 360.

Designed with C++'s specifics in mind, Google C++ Mocking Framework (or Google Mock for short) is a library for writing and using C++ mock classes.