NGI Zero Discovery and NGI Zero PET are a significant effort and ambitious effort by a large group of organisations led by NLnet foundation (that was instrumental in pioneering the early internet in Europe):
Accessibility Foundation - Center of expertise on accessibility of internet and other digital media for all people, including the elderly and people with disabilities
Association for Progressive Communications - A global network and organisation that strives towards easy and affordable access to a free and open internet to improve the lives of people and create a more just world
Center for the Cultivation of Technology - A charitable non-profit host organization for international Free Software projects
Commons Caretakers - A not-for-profit service provider for the development of Commons
Network Security Group of Eidgenössische Technische Hochschule Zürich - Academic research institute focused on building secure and robust network systems
Free Software Foundation Europe - Association charity that aims to empower users to control technology.
ifrOSS - Provides not-for-profit legal services and studies in the context of free and open source software
NixOS Foundation - Foundation supporting development and use of purely functional configuration management tools, in particular NixOS and related projects
NLnet Foundation (NL) - Grantmaking public benefit organisation founded by pioneers of the early European internet
Petites Singularités - Non profit organisation working with free sofware and focusing on collective practices
Radically Open Security - Not-for-profit open source security company
TIMIT - Experts in secure software
Translate House - Develops and implements open source localization solutions
The budget for the effort is kindly provided by the European Commission.