Wiki.js is an AGPLv3-licensed open-source wiki and documentation platform created by Nicolas Giard, a Montréal-based senior software developer (currently at IETF Administration LLC), and first released in 2016. The codebase is written in JavaScript on Node.js with a modern UI, fast performance, and a modular architecture that supports multiple database backends (PostgreSQL, MySQL, MariaDB, MS SQL Server, SQLite), multiple storage backends (Git sync, AWS S3, Azure Blob, Google Cloud Storage, local/network), multiple authentication options (local, LDAP, SAML, Azure AD, social OAuth), and multiple search providers (built-in DB search, Algolia, Azure Search, Elasticsearch). The project reports more than 100M downloads and 28k+ GitHub stars; supported by sponsors including DigitalOcean, GitHub, Cloudflare, and Netlify.
For procurement-grade EU buyers Wiki.js is structurally clean for the self-host path. The licence is full AGPLv3 with the standard copyleft requirements (any network-distributed modification must publish source under AGPL) so it suits in-house documentation use cases without complications. Self-host on EU infrastructure (Hetzner, OVHcloud, Scaleway, IONOS, STACKIT, T Cloud Public, or any other EU-incorporated host) delivers no CLOUD Act exposure and no vendor counterparty. The maintainer is Canadian; Canada holds an EU adequacy decision under Art. 45 GDPR so cross-border transfers between EU and Canada need no SCCs, but for self-host deployments the maintainer-jurisdiction is irrelevant since the customer controls all data flows.
Pricing is free for the open-source codebase; commercial support is offered via the maintainer + community. Best fit: developer teams and engineering organisations building internal documentation, EU SMBs and public-sector buyers wanting a Node.js modern stack alternative to MediaWiki / DokuWiki, customers who need Git-versioned content with full self-host control, and any organisation that prefers Node.js to PHP (vs BookStack which is PHP/Laravel-based).