Bénévalibre
Countries: France
Functions: Volunteer management
Structure: Open-source base system
Object flexibility: None identified
Structure: Open-source base system
A fully-fledged constituent or customer management system whose code is open and modifiable. Some are built for the nonprofit sector, such as CiviCRM, and others are general-purpose business systems adopted by nonprofits, such as Dolibarr.
What they share is the licence: an organisation with development capacity can change the system itself rather than waiting for a vendor. Being free to download does not by itself qualify a product; the test is whether the working system is open and modifiable, and a complete constituent management system rather than a framework something else has been built on. Hosting, support and implementation are usually still paid for.
CiviCRM (platform)
Countries: Global
Functions: Case management and service delivery, Fundraising, Events and ticketing, Membership
Structure: Open-source base system
Platform: CiviCRM
Object flexibility: Developer or vendor
ERPNext for Non-Profits
Countries: India
Functions: Fundraising, Grant-making, Membership, Volunteer management
Structure: Open-source base system
Object flexibility: No code
Galette
Countries: France
Functions: Membership
Structure: Open-source base system
Object flexibility: None identified
Pino
Countries: Finland
Functions: Membership
Structure: Open-source base system
Object flexibility: Developer or vendor
Rock RMS
Countries: USA
Functions: Congregation and church management
Structure: Open-source base system
Object flexibility: Developer or vendor
SinergiaCRM
Countries: Spain
Functions: Fundraising, Events and ticketing, Volunteer management
Structure: Open-source base system
Object flexibility: No code