Semantic wikis

translatewiki.net, formerly named Betawiki, is a web-based translation platform powered by the Translate extension for MediaWiki. It can be used to translate various kinds of texts but is commonly used for creating localisations for software interfaces.

online knowledge base (2007–2016)

catalog of free software, project of the Free Software Foundation

wiki that has an underlying model of the knowledge described in it

MicroWiki is a free online encyclopedia about micronations launched in 2005. It has since become the principal way in which Internet users document micronational matters, as most do not meet Wikipedia's notability requirements. It is maintained by volunteers using the same MediaWiki software as Wikipedia. MicroWiki describes itself as "the largest encyclopedia about micronations".

SNPedia (pronounced "snipedia") is a wiki-based bioinformatics web site that serves as a database of single nucleotide polymorphisms (SNPs). Each article on a SNP provides a short description, links to scientific articles and personal genomics web sites, as well as microarray information about that SNP. Thus SNPedia may support the interpretation of results of personal genotyping from, e.g., 23andMe and similar companies.

NeuroLex is a lexicon of neuroscience concepts supported by the Neuroscience Information Framework project, which is funded by the NIH Blueprint for Neuroscience Research. It is the lexical part of the NIF knowledge base, and NeuroLex is intended to make literature review easier and ensure consistent terminology and usage across researchers for the topics of experimental, clinical, and transnational neuroscience, and for genetic and genomic resources. It is structured as a semantic wiki, using Semantic MediaWiki.

saveMLAK is a wiki designed to coordinate responses to the 2011 Tōhoku earthquake and tsunami, focusing on protecting museums, libraries, archives and kominkans, or community centers. It was started in March 2011, a day after the earthquake and tsunami hit. Makoto Okamoto is the site's founder and main administrator. The wiki runs on the MediaWiki software, along with the extension Semantic MediaWiki.