format, .abw, uses XML, so as to mitigate vendor lock-in concerns with respect to interoperability and digital archiving. Grammar checking The AbiWord project includes a US English-only grammar checking plugin using Link Grammar. AbiWord had grammar checking before any other open source word processor, although a grammar checker was later added to OpenOffice.org. Link Grammar is both a theory of syntax and an open source parser which is now developed by the AbiWord project. See also List of free and open-source software packages List of word processors Comparison of word processors Office Open XML software OpenDocument software References External links Andrew Leonard: Abiword Up. Salon.com, November 15, 2002. History of the project and comparison with closed source development. Interview with Development team after 2.6 release AbiWord: A Small, Swift Word Processor Office software that uses GTK Free software programmed in C++ Free word processors Linux word processors MacOS word processors Windows word processors Cross-platform free software Portable software 1998 software Software using the GPL license