Ecosyste.ms: OpenCollective

An open API service for software projects hosted on Open Collective.

Backdrop CMS

Backdrop is a free and Open Source Content Management System that helps you build modern, comprehensive websites for businesses and non-profits.
Collective - Host: opensource - https://opencollective.com/backdrop-cms - Website: https://backdropcms.org - Code: https://github.com/backdrop

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Backdrop core code repository.
github.com/backdrop/backdrop - 7 versions - Latest release: almost 10 years ago