to several database libraries, including PostgreSQL and SQLite. An HTTP server and client, with the Furnace web framework. Efficient homogeneous arrays of integers, floats and C structs. A library implementing regular expressions, generating machine code to do the matching. A foreign function interface is built into Factor, allowing for communication with C, Objective-C and Fortran programs. There is also support for executing and communicating with shaders written in GLSL. Factor is implemented in Factor and C++. It was originally bootstrapped from an earlier Java implementation. Today, the parser and the optimizing compiler are written in the language. Certain basic parts of the language are implemented in C++ such as the garbage collector and certain primitives. Factor uses an image-based model, analogous to many Smalltalk implementations, where compiled code and data are stored in an image. To compile a program, the program is loaded into an image and the image is saved. A special tool assists in the process of creating a minimal image to run a particular program, packaging the result into something that can be deployed as a standalone application. The Factor compiler implements many advanced optimizations and has been used as a target for research in new optimization techniques. References External links – a presentation written in Factor which mentions and praises Factor Programming languages Concatenative programming languages Function-level languages Stack-oriented programming languages Programming languages created in 2003 Extensible syntax programming languages 2003 software High-level programming languages Software using the BSD license