Elgg vs Momentive Community

Elgg is a free, open-source framework for building web applications where people sign in and share information. It can serve as a foundation for campus networks, organizational collaboration platforms, or company communications tools. Hooks and events let plugins extend or change application behavior, while the view system supports custom themes. Granular content access policies can support private networks and intranets; user groups and a file storage API provide building blocks for managing members and their files. Elgg supports on-site and email notifications, as well as RPC web services for external applications and mobile clients. Its listed security features include anti-CSRF validation, XSS filters, HMAC signatures, and password hashing. The project offers documentation, tutorials, an API reference, community discussions, and a repository with more than 1,000 open-source plugins. It is free to download, install, and use. The full package with core plugins is offered under GPLv2; the framework without plugins is offered under MIT. Self-hosting requires a database and a configured cron job for background tasks.

Momentive Community has no write-up on Specifiction yet; its figures are above.