Xtensio

Xtensio is a business communications platform that enables teams to create, collaborate on, and share interactive 'living documents' such as proposals, reports, and presentations. It offers a drag-and-drop editor, customizable templates, centralized asset storage, and features for team collaboration and engagement analytics. Users can brand their documents and portals, and share them via live links, PDF, or embed them on websites.

Xtensio is a platform for creating and sharing 'living documents' and offers features that align well with brand guideline management. It provides centralized storage for assets, an editor for creating documents (which can serve as brand guidelines), shareable links for these documents, and version history. It also allows for customization of colors and fonts, which are key components of brand guidelines. The platform emphasizes collaboration and offers features like workspaces and user roles, which support team-based brand management. While it's not exclusively a brand guideline tool, its capabilities strongly support this use case.