Thai plugin for Multiling O Keyboard. This is not an independent app, please install OKeyboard along with this plugin.

Instruction:
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⑴ Install this plugin and Multiling O Keyboard.
⑵ Run O Keyboard and follow its setup guide.
⑶ Slide space bar to switch languages.

Please email if you have any questions.

Wikipedia:
Thai,[3] or more precisely Siamese[4] or Central Thai,[5] is the national and official language of Thailand and the native language of the Thai people and Thai Chinese. Thai is a member of the Tai group of the Tai–Kadai language family. Over half of the words in Thai are the amalgamation of Pali, Sanskrit and Old Tai-Mon-Khmer language. It is a tonal and analytic language. Thai also has a complex orthography and relational markers.[citation needed] Thai is mutually intelligible with Lao.[6]
Thai script (Thai: อักษรไทย; RTGS: akson thai; [ʔàksɔ̌ːn tʰāj] About this sound listen) is used to write the Thai language and other minority languages in Thailand. It has 44 consonant letters (Thai: พยัญชนะ, phayanchana), 15 vowel symbols (Thai: สระ, sara) that combine into at least 28 vowel forms, and four tone diacritics (Thai: วรรณยุกต์ or วรรณยุต, wannayuk or wannayut).
Although commonly referred to as the "Thai alphabet", the character set is in fact not a true alphabet but an abugida, a writing system in which each consonant may invoke an inherent vowel sound. In the case of the Thai script this is an implied 'a' or 'o'. Consonants are written horizontally from left to right, with vowels arranged above, below, to the left, or to the right of the corresponding consonant, or in a combination of positions.
Thai has its own set of Thai numerals which are based on the Hindu Arabic numeral system (Thai: เลขไทย, lek thai), but the standard western Hindu-Arabic numerals (Thai: เลขฮินดูอารบิก, lek hindu arabik) are also commonly used.

Photo: Gray Lake by Romain Guy