I have read some discussions here about for-profit vs. not-for-profit International Schools in Singapore.
I've learnt recently that not-for-profit schools in Singapore register as charities with the Singapore Government. (I am not sure I am allowed to post websites; you may google charity portal Singapore to see which schools are registered charities.)
So far I can find Tanglin Trust, UWC, Singapore American School, International Community School, German European School, Swiss School, Hollandse School, Lycee Francaise (French school), Japanese School (I did not check all the schools)
I remember someone mentioned that Nexus is a not-for-profit school but I cannot find it listed as a charity.