Indonesian
Indonesian (Wikipedia:Indonesian language) is an Austronesian language and the official language of Indonesia. Since it is a register of Malay, it is also often generally understood by Malay speakers, who primarily are in Malaysia, Brunei, and Singapore.
In Apertium, there is a language pair of Indonesian and Malaysian already in the trunk category as well as contrastive grammar for English and Indonesian.
Resources
This section lists resources available on Indonesian.