Extempore is a live coding environment focused on real-time audiovisual software development. It is designed to accommodate the demands of cyber-physical computing.Sorensen, Andrew, and Henry Gardner. 2010. "Programming with Time: Cyber-Physical Programming with Impromptu." In Proceedings of the ACM International Conference on Object Oriented Programming Systems Languages and Applications, 822–34. New York: ACM. Extempore consists of two integrated languages, Scheme (with extensions) and Extempore Language. It uses the LLVM cross-language compiler to achieve performant digital signal processing and related low-level features, on-the-fly. It is free and open-source software with a BSD 3-clause license.
Relationship to Impromptu Extempore shares the use of Scheme syntax, real-time audiovisual emphasis and lead developer Andrew Sorensen with the older and related project Impromptu. It runs under Linux and macOS. The language bindings to Apple libraries are absent, but the environment can interface with dynamic libraries.
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