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* An [[HTTP]] server and client, with the Furnace web framework.<ref>{{cite web | url = http://docs.factorcode.org/content/article-http.server.html | title = Factor documentation: HTTP server | first = Slava | last = Pestov}}</ref>
* Efficient homogeneous arrays of integers, floats and C structs.<ref>{{cite web | url = http://docs.factorcode.org/content/article-specialized-arrays.html | title = Factor documentation: Specialized arrays | first = Slava | last = Pestov}}</ref>
* A library implementing regular expressions, generating machine code to do the matching.<ref>{{cite web | url = http://docs.factorcode.org/content/article-regexp.html | title = Factor documentation: Regular expressions |
A [[foreign function interface]] is built into Factor, allowing for communication with [[C (programming language)|C]], [[Objective-C]] and [[Fortran]] programs. There is also support for executing and communicating with shaders written in [[GLSL]].<ref name="dls"/><ref>{{cite web | first = Slava | last = Pestov | url = http://factor-language.blogspot.com/2010/07/overhauling-factors-c-library-interface.html | title = Overhauling Factor's C library interface| date = 28 July 2010 }}</ref>
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 [[system image|image]]-based model, analogous to many [[Smalltalk]] implementations, where compiled code and data are stored in an image.<ref>{{cite web | first = Slava | last = Pestov | url = http://factor-language.blogspot.com/2010/01/factors-bootstrap-process-explained.html | title = Factor's bootstrap process explained| date = 10 January 2010 }}</ref> 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.<ref name="dls"/><ref>{{cite web | first = Slava | last = Pestov | url = http://factor-language.blogspot.com/2008/07/on-shaking-trees.html | title = On shaking trees| date = 5 July 2008 }}</ref>
The Factor compiler implements many advanced optimizations and has been used as a target for research in new optimization techniques.<ref name="dls"/><ref>{{cite web|first=Daniel |last=Ehrenberg |title=Closure elimination as constant propagation |url=http://factorcode.org/littledan/abstract.pdf |year=2010 |url-status=dead |archive-url=https://web.archive.org/web/20110726044425/http://factorcode.org/littledan/abstract.pdf |archive-date=2011-07-26 }}</ref>
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