PHOIBLE (Phonetics Information Base and Lexicon) is a knowledge base of phonological inventories, structured as a queryable and extensible mathematical graph. The knowledge base includes allophonic detail for many languages, and all phones are encoded as IPA unicode and as vectors of distinctive features, allowing "fuzzy" queries for classes of sounds instead of searching using individual glyphs. As of January 2012, there were over 1500 languages included.
Moran, S., McCloy, D.R., & Wright, R.A. (eds.) (2014). PHOIBLE Online. Leipzig: Max Planck Institute for Evolutionary Anthropology. (Available online at phoible.org)
McCloy, D.R., Moran, S., & Wright, R.A. (2013). Revisiting ‘The role of features in phonological inventories’. Paper presented at the CUNY Conference on the Feature in Phonology and Phonetics, New York, NY.
Moran, S., McCloy, D.R., & Wright, R.A. (2012). Revisiting the population size vs. phoneme inventory size. Language, 88(4), 877–893. doi:10.1353/lan.2012.0087.
Moran, S., McCloy, D.R., & Wright, R.A. (2012). Revisiting the population vs phoneme-inventory correlation. Presented at the 86th Meeting of the Linguistic Society of America, Portland, OR. [slides] [extended abstract]
Moran, S. (2011). Technological infrastructure for comparative linguistics and linguistic fieldwork: Some case studies. Presented at Max-Planck-Institut für evolutionäre Anthropologie, Leipzig, 27 January 2011.