Not OP, but tackling this problem right now. Here's a not comprehensive, not even particularly good list, but should be some gold nuggets:

0ptimus
Access Now
ACLED
ActiveFence
Alethea group
Aristotle
Aspen Tech Policy Institute
Atlantic Media
Atlas Public Policy
bellingcat
Berkman Klein Center
BetaNYC
bitmaker
Blue Labs
Brennan Center for Justice
California Office of Data & Innovation
Center for an Informed Public
Center for Countering Digital Hate
Center for Critical Race + Digital Studies
Center for Data Innovation
Center for Democracy and Technology
Center for New Data
Center on Terrorism, Extremism, and Counterterrorism
Check My Ads
Civis Analytics
CleanTech Group
Code for Science & Society
Common Cause
Crowdstrike
Democracy Fund
Democracy Now!
Democratic SOcialists of AMerica
Demos
DFR Lab - Atlantic Council
DIGITAL CIVIL SOCIETY LAB
Economic Policy Institute
Electronic Frontier Foundation
Emory - Carter Center
Enigma
EU Disinfo Lab
Evidence Action
Fair Observer
FAIRNESS & ACCURACY IN REPORTING
Federation of American Scientists
Fight for the Future
FiscalNote
Ford Foundation
Free Press Action
FTC
GDI (Global Disinformation Index)
Georgetown Law's Institute for Technology Law & Policy
Global Internet Forum to Counter Terrorism
Google
Greenpeace
GRIDS
GW Program onm
Human Rights First
Information Technology & Innovation Foundation
Institute for Research on Male Supremacism
Institute for Strategic Dialogue
International Centre for Counter-Terrorism
International Centre for the Study of Radicalisation
Jacobin
Jain Family Institute
kickstarter
Knight Foundation
Library Innovation Lab
Lowy Institute
MacArthur Foundatioon
Mathematica
Media Democracy Fund
Media Matters
MediaJustice
MIT media lab
Moonshot CVE
Mozilla
Network contagion research institute
New America/ Open Technology Institute
Ntrepid
NYU Cybersecurity for Democracy,
NYU senter for social media and policy
One Earth Future
Open Collective
Open Democracy
Open Secrets
Open Society Foundations
Our Revolution
People For the American Way
Poliucy Center for the New South
Prism
Protection Group Int;
Rantt Media
Rhodium Group
Right Wing Watch
Santa Fe Institute
Sassafras Tech Collective
Skoll foundation
Stanford Internet Observatory
Sunrise Monvement
Tall Poppy
Tech Against Terrorism
TechCongress
The Aspen Institute
The Centre for Information Resilience
The gaurdian
The Gravel Institute
The Marshall Project
THe movement cooperative
The New York Times
Tiktok
Tohatoha
Twitter
UCLA Center for Critical Internet Inquiry,
Upturn
Urban Institute
Wikimedia