BIMserver vs RIB iTWO

BIMserver stores and manages building-project information as IFC data, using structured model objects rather than treating the project as a collection of files. Users can check, version, merge, query, and filter models, arrange project structures, and generate IFC output on demand. Multi-user support lets people work on separate parts of a dataset, with notifications when a model or section changes. BIMserver is intended to serve as an IFC backend for other software, and developers can add plugins, services, and clients or embed it in their products. The listed service interfaces are SOAP, JSON, and Protocol Buffers. It is open-source and self-managed, with a free plan under the AGPL-3.0 license; some plugins and libraries use different licenses. It supports Linux, macOS, Windows, web, API, and self-hosted use. The project wiki points to GitHub Releases for downloads and includes an Ubuntu installation guide. For help, maintainers point users to the wiki, FAQ, issue tracker, and contributors, and list an email contact. The project says its open-source community has been active since 2013.

RIB iTWO has no write-up on Specifiction yet; its figures are above.