Fluid is developed by Todd Ditchendorf.
Once upon a time, Todd worked for a well-known Fruit Company based in Cupertino as Dashboard Engineer, developing Dashboard and Dashboard Widgets for Mac OS X Leopard.
FAQ
Is Fluid Free? Yep, the basic version of Fluid is totally free… go ahead, try it out!. For $5 you can purchase a Fluid License which unlocks the following features:
Is Fluid available for Mac OS X 10.5 Leopard or earlier? No. Fluid runs on Mac OS X 10.6 Snow Leopard or later only.
Is Fluid available for PowerPC Macs? No. Fluid runs on Intel Macs only.
Is Fluid available for Macs with 32-bit processors? No. Fluid runs 64-bit only.
Can I somehow redistribute Fluid Apps I create with Fluid to friends/coworkers? I'd prefer you didn't do that. Tell your friends about Fluid, and let them try it out for themselves!
Credits
Fluid was originally inspired by Mozilla Prism and Adobe Air.
Fluid owes its existence to several open source projects listed below.