Sarabun is an open source multi-script webfont that supports both Latin and Thai. It is the "TH Sarabun New" font, made available under the Open Font License. The name "Sarabun" (สารบรรณ, RTGS: Saraban) means documentary affairs. The font is used in the Government Gazette of Thailand newspaper, and you can read more details about this font project on Wikipedia's National Fonts page.