Wikipedia
Open Source
Wikipedia is the most popular community-created knowledge base.
XWiki
Freemium
XWiki is a free wiki software platform written in Java with a design emphasis on extensibility.
Confluence
Commercial
Confluence is a team collaboration software. Written in Java and mainly used in corporate environments.
TiddlyWiki
Open Source
TiddlyWiki is an open-source single page application wiki in the form of a single HTML file that includes CSS, JavaScript, and the content.
Fandom
Free
Fandom is an entertainment site where fans come first.
Nuclino
Freemium
Nuclino is a cloud-based team collaboration software which allows teams to collaborate and share information in real-time.
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Compare TiddlyWiki and Referata and decide which is most suitable for you.
Compare Confluence and Referata and decide which is most suitable for you.