Take a look at MoneyWorks.
They have a FileMaker plug-in (free) that we've been able to achieve simple and easy integration with that saves us hours of double data entry. I plan on going further with integration between MoneyWorks and FM once a plug-in version is compatible with FM 13.
Good luck in your seach.
Hope this helps.
Head Honcho, CustoMike Solutions
Member, FileMaker Business Alliance & FileMaker Technical Network
FileMaker 7 - 12 Certified Developer
ph 0414 562 501
Thanks for the feedback. I'll check this out for sure.