Elgg

Elgg is an open-source framework for building web communities and collaborative applications. It fits schools and organizations that can run their own software and tailor it with plugins. Its strength is control over behavior, design, and access; its cost is the technical work of hosting and maintaining it.

Overview

Elgg provides building blocks for campus networks, organizational collaboration, and company communications. It is aimed at teams creating a social web application around their own needs, rather than people looking for a ready-made community service. Granular access policies can support private networks and intranets, making Elgg a practical option when control over who sees content matters.

That flexibility also means the organization takes on setup and ongoing operation. An installation needs a database and a configured cron job for background tasks such as notifications and database cleanup. Composer is recommended for installation and maintenance, with a pre-packaged ZIP also available.

Key features

• Plugin extension: Hooks and events let plugins change or add to much of an application's functionality and behavior. The community repository has more than 1,000 open-source plugins, offering builders a substantial starting point while leaving them to choose and fit the extensions their project needs.
• Custom presentation: Elgg's view system lets plugins work together to create themes. This suits teams that want to shape the interface alongside application behavior.
• Private spaces, groups, and files: Granular content policies support private communities, while user groups and a file storage API give plugins ways to organize members and handle user-generated files.
• Integration and notifications: RPC web services support connections to external applications and mobile clients. On-site and email notifications are supported, and the notification service can connect with third-party services.
• Security mechanisms: Elgg includes anti-CSRF validation, strict XSS filters, HMAC signatures, and password hashing using current cryptographic approaches. These measures are useful parts of a self-hosted application, alongside the operator's responsibility for running and maintaining the installation.

Pricing

Elgg's Free plan costs nothing, billed Free to download, install, and use. There is no paid Elgg plan in this pricing model, so the main trade-off is operational: the organization must provide its own installation and hosting.

License choice affects what is included. The full framework with core plugins is available under GPLv2. The framework without plugins is available under MIT; that release excludes the mod directory, where Elgg's plugins are kept. Teams choosing MIT should account for that difference when deciding whether the package meets their needs.

Platforms

Elgg supports web applications and self-hosted deployments, and provides an API for integrations. Its installation guide covers running it on your own server. Third-party hosting providers are listed, but the project does not officially endorse them.

Who it's for

Elgg is suited to universities, schools, colleges, companies, and other organizations building a community or collaboration platform around specific requirements. It is especially relevant when private spaces, extensible behavior, and custom presentation matter enough to justify operating the software. Teams without the capacity to manage a database, scheduled background tasks, and ongoing installation upkeep are better served by a platform that handles those responsibilities.

Pros and cons

• Pros: Open-source foundation with no download or use fee. The GPLv2 package includes the framework and core plugins, while the MIT package offers the framework without plugins.
• Pros: Extensive customization options. Hooks, events, views, and a repository of more than 1,000 plugins give builders room to adapt functionality and presentation.
• Pros: Controls for private communities. Granular access policies, groups, and file support suit organizational spaces and intranets.
• Cons: Self-hosting is part of the job. A database and configured cron job are required, and the organization must manage installation and upkeep.
• Cons: The MIT package omits plugins. Teams that want core plugins need to choose the GPLv2 package.
• Cons: Support is community-oriented. Elgg points users to discussions, technical forums, documentation, and professional service providers, so organizations seeking a single managed support channel may prefer another approach.

Alternatives

HumHub is another self-hosted open-source option, with an AGPLv3 Community Edition, module marketplace access, and community support; consider it if that package and module approach better fits your project. BuddyPress is a free, self-hosted WordPress plugin, so it may suit a community project built around WordPress. NodeBB offers a free plan and a Starter plan at $20 a month, with 50,000 pageviews and 5gb storage; consider it if those stated hosted-plan allowances fit your needs. Discourse has a free plan with unlimited members, two staff seats, 500k monthly page views, and 20k mont; consider it if those member and usage limits suit the community. Geneva is a free web, Android, and iOS option with group chats and community features. ProfileGrid has a free Core plan with 90+ core features and free extensions, plus a Premium plan at $79 a month; consider it if that plan structure suits the project. BuddyBoss Platform offers a free WordPress community platform and a Platform Pro plan at $99 a year, which includes updates and support. Circle is a paid option with a Professional plan at $89 a month on annual billing, including unlimited members, three admins, 10 moderators, 20 spaces, a 2% transaction fee, and 200GB storage; consider it if those managed-plan terms suit your community.

Browse more options in Social Networking Software, Online Community Platforms, and Community Platforms.

Verdict

Choose Elgg if your school or organization wants to build a private, extensible community and can take responsibility for self-hosting. Its strongest reason to choose is the combination of open-source access controls and broad plugin customization without a software fee. Look elsewhere if you need a turnkey hosted platform or do not want to manage the database, cron job, and installation.