Versatile: You can strip down to a core system, or build up with 3rd-party addons.

Full API documentation

High coding standards: No PHP notices. Type-strict codebase. MVC framework.

Free online developer's guide book (in the tutorials)

Custom field filters: For example, restrict news posts to a minimum length.

Stack traces for easy debugging

Synchronise data between staging and live sites using Resource-fs

Breadcrumb overrides

Advanced banning: Set your own banning rules for different hack attack codes. Even create your own ban pages (e.g. to mimic law enforcement bans for spammers).

Code overrides: Implement modifications to the Composr code without directly editing the original code by creating _custom files. This makes upgrading much easier. Also supports contentious_overrides hooks and the override_api for more advanced overriding.

Many different hook types allowing for modifying or extending Composr without modifying or overriding the code.

• Content Updates: Notifications for new or updated content, such as news articles, forum posts, and gallery images.
• Private Messages: Alerts for new private messages received.
• Friend Requests: Notifications for new friend requests.
• Administrative Actions: Alerts for actions taken by site administrators, such as account approvals or content moderation decisions.

• Email: Notifications sent directly to their email address.
• Digest Email: Combined summaries of activity sent in batched emails. This requires the system scheduler and the digest e-mails configuration option to be enabled.
• Private Topics: Notifications delivered as private forum topics.
• SMS: Notifications sent as text messages (requires configuration and incurs costs).
• Web Notifications: Real-time alerts displayed within the Composr interface.

• Rank ladders: Use the default rank ladder for main site ranks and secondary usergroups for subcommunity memberships.
• New member status: Set default usergroups for new members to grant them initial access while allowing removal if necessary.
• Leadership: Assign leaders to usergroups to allow members to manage subcommunities.
• Clubs: Consider using Clubs for member-driven subcommunities with their own forums.

• No special permissions by default, simplifying permission management.
• Members can join and leave like regular usergroups.
• Provide a dedicated forum for the club.

• Sharing modules across zones: Create a redirect to make a module in one zone appear in another.
• Creating shortcuts: Use a redirect to point a short URL to a longer, more complex URL.
• Moving pages: Use a redirect to ensure old links still work after moving a page to a new location.

• Enable "Virtual root links" in the Admin Zone > Setup > Configuration > Feature options > Advanced.
• Navigate to the desired category while logged in as staff.
• Click the rightmost link in the breadcrumbs (it will be an anchor for virtual root creation).
• Use the resulting URL in your menus to link to the "virtualized" category.

• Zones: Create separate sections under different URLs with their own pages and content.
• Redirects: Make modules appear in different zones without actually moving them.
• Categories & Virtual Roots: Organize content like galleries, downloads, and catalogs into sub-trees that appear as separate entities.
• Usergroups & Permissions: Group members into subcommunities and control their access to specific content.
• Themes: Customize the look of different zones.

• Full control: You have complete control over each site's settings and content.
• Administrative separation: Managing staff and content for each site is more organized.
• Special M.S.N. features: Composr provides specific features like the 'netlink' system for easy navigation between network sites.

• Configuration and maintenance: Setting up and maintaining multiple sites can be more complex.