There is a product called Rekall http://www.thekompany.com/products/rekall/ which provides a front end to a number of backend dbs, inc MySQL and PostgreSQL
This looks quite good and complete, and it's been GPL'ed. Just took a quick look around their site and noticed that of 2.3.1 it allows http access - a feature that many Filemaker Pro users like and use. Without having tried it this could be the answer.
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