An ellipsis is a series of dots, (usually 3, i.e. "…") used to indicate the omission of a word within some text, or more commonly that the preceding text has been truncated.

A toolkit for building modeling frameworks like Active Record. Rich support for attributes, callbacks, validations, serialization, internationalization, and testing.

A type of encryption where the same key is used to encrypt and decrypt the message.

The reactor design pattern is an event handling pattern for handling service requests delivered concurrently to a service handler by one or more inputs. The service handler demultiplexes the incoming requests and dispatches them synchronously to the associated request handlers.

Offline caching typically means storing locally the data obtained from a remote service to make it possible to browse the data even when there is no connection to the storage.

Hamcrest is an open source library of constraint classes used to match objects and values, typically by other frameworks such as unit testing, mocking, or collections.

Modularity describes the degree to which a system’s components may be separated and recombined. It refers to both the tightness of coupling between components, and the degree to which the “rules” of the system architecture enable (or prohibit) the mixing and matching of components.

Prawn is a fast, nimble Ruby library for creating PDF files.

Slick2D is a wrapper around the LWJGL OpenGL library for Java.

Assetic is an asset management framework for PHP.

Locust is a Python based load testing framework (http://locust.io/)