I'm apparently too lazy to write Wikipedia articles, but not too lazy to identify needed articles. In cases where I have links that may be helpful to article writers, I've included them.
Center for Security and Emerging Technology (CSET)
Think tank at Georgetown University launched in 2019 with a $55m grant from the Open Philanthropy Project.
https://www.georgetown.edu/news/q-and-a-with-cset-founding-director-jason-matheny
Animal Charity Evaluators
Has a sentence in the main EA article.
Centre for Effective Altruism
Mentioned in the 80,000 Hours and Giving What We Can articles.
Forethought Foundation / Global Priorities Institute
Organizations associated with William MacAskill.
Effective Altruism Foundation / Stiftung für Effektiven Altruismus
Parent organization of Raising for Effective Giving and other projects.
The AI Does Not Hate You
New book by Tom Chivers just released in the UK. Focused on AI risk and the rationality movement, but covers EA and EA-relevant AI safety organizations.
Ought
Machine learning research organization that has received grants from the Long Term Future Fund and the Open Philanthropy Project. Note: there currently do not seem to be any news or magazine articles about it, which may be an obstacle to a Wikipedia article.
Center for Human-compatible AI (CHAI)
UC Berkeley research group funded by the Open Philanthropy Project and others.
Kelsey Piper / Future Perfect
Future Perfect has a paragraph in the main EA article.
The original book was well received and got significant amounts of attention (e.g. an excerpt ran in the NYT, Peter was on the Colbert Report to talk about it, etc.). It was also highly influential, and has contributed to the way a lot of EAs (including Cari Tuna) think about giving. I’m not sure how many languages it’s been translated into, but it’s a pretty good number.
The organization has also received attention from a variety of major media outlets and has moved a considerable amount of money to effective charities (~$5.25 million in 2018 and expected to be much higher in 2019). With the publicity push around the release of the new edition, there should be much more media attention around the corner.
Also, Peter Singer is clearly notable and disambiguating the book and the nonprofit will help clarify discussion about Peter. The disambiguation is becoming even more important with the new edition (which will have substantial changes), as there will soon be two books and a charity all with the same name.