Very cool page! Great links to some amazing projects on the stm32f4.
I see you mention Lua and JavaScript on the stm32f4, have you seen micropython running on it?
https://github.com/micropython/micropython/wiki/Board-STM32F...
Seriously, a chip like this hasn't been out in a long time. Sure there are more powerful ones like the BeagleBoards and RPis, but they require more support hardware, space, components and power. Hell, the stm32f4 can run with just a few capacitors and no external crystal, and still have 24 analog inputs, two analog outputs and floating point. Plus it has internal cache so it can run at 168+ MHz and DMA, etc.
http://www.st.com/web/en/news/n3547
BTW , my mistake , it's stm32f3 , altough it's cortex-m4. a bit weird naming.