XWiki is an open-source wiki platform written in Java, used by organisations to build knowledge bases, documentation and intranets. It offers structured wiki pages, WYSIWYG editing, tagging, advanced permissions, full-text search, version control and REST access. You can install the software yourself (on-premises) or use it as XWiki Cloud; the company XWiki SAS also provides support, installation and training.
The software is licensed under the GNU Lesser General Public License. XWiki SAS, the commercial company behind the project, is a French company with staff in France and Romania. According to the company, XWiki Cloud runs on OVHcloud infrastructure in France, with backups at Scaleway in France, and the company states that no transfers to third countries are involved. The cloud service is ISO 27001 certified. Because the source code is open and you can run XWiki on your own infrastructure, a European organisation keeps control over hosting location, keys and data, without depending on a non-European cloud provider.