Admidio is a free, open-source membership and organization management application that has been in active development since 2004. It is designed specifically for associations, clubs, and community groups that need to manage members and administrative tasks online.
The software is self-hosted and built in PHP, so organizations install it on their own web hosting rather than using a hosted SaaS product.
Key Features
Admidio includes a role-based member database with access controls, customizable and exportable membership lists (Excel, PDF, CSV), event management with online registration, photo galleries, document and file sharing, and CSV import/update tools for member data.
The platform supports plugins for extended functionality and lets organizations assign different rights to roles such as group leaders and webmasters.
Development & Community
Admidio has been developed continuously since 2004, with an active open-source community maintaining the project on GitHub and supporting users through forums and social channels.
Key Features
Role-based member database — Manage member data with access controls tied to organizational roles.
Event management — Create events with online registration for members.
Photo galleries — Organize and share photo albums with members.
Document & file sharing — Share files and documents within the organization.
Exportable membership lists — Export member lists to Excel, PDF, or CSV.
Plugin support — Extend functionality with community plugins.
Pros & Cons
Pros
Free and fully open source with no licensing cost
Purpose-built for clubs and associations, not a generic tool
Full data control through self-hosting
Long-running, actively maintained community project since 2004
Cons
Requires your own PHP web hosting to run
Interface is less modern than some commercial membership platforms
Smaller ecosystem and support base than mainstream SaaS alternatives
Frequently Asked Questions
Is Admidio free?
Yes, Admidio is free and open source with no licensing fees.
Do I need to host Admidio myself?
Yes, it's a self-hosted PHP application that you install on your own web hosting.
Who is Admidio for?
It's designed for clubs, associations, and community organizations managing members, events, and documents.
Can Admidio manage event registrations?
Yes, it includes event management with online registration functionality.