Plone integrates with Active Directory, Salesforce, LDAP, SQL, Web Services. LDAP or Oracle. Based on Python and the Zope libraries, Plone has a technological edge that has has helped it attain the best security track record of any major CMS.
Its features include Easy collaboration and sharing, Versioning, history and reverting content, visual HTML editor, Powerful workflow capabilities, Flexible authentication back-end, Full-text indexing of Word and PDF documents, Support for the search engine Sitemap protocol, Support for multiple mark-up formats, Wiki support, Rules engine for content, Portlets engine, LiveSearch, Outstanding multilingual content management, Time-based publishing, Human-readable URLs, Easy-to-use, powerful graphical page editor, Resource compression, Powerful caching proxy integration, Workflow, Powerful standard content types, Content is automatically formatted for printing, Pervasive RSS feed support, Automatic image scaling and thumbnail generation, Rich ecosystem of free add-on products, Cross-platform, Comment capabilities on any content, Simple installer packages for multiple platforms, WebDAV and FTP support, In-context editing, "Hot backup" support.
Professional support, development, hosting & training are also provided.