The LinuxCNC wiki has detailed instructions on how to build a Raspian image with the Xenomai development framework / realtime kernel extension. They also link to a ready made image if you don’t want to build it yourself.
If you build yourself and copy and paste the comands into your shell be aware that under item “5. Create SD card image / Populate BOOT” there seems to be a random character in the command: “sudo cp linux-rpi-3.2.27/build/arch/arm/boot/Image mnt/boot/kernel.img” behind the “…/boot/Image” part, remove it otherwise it will not execute.
The BitScope BS05U is a simple Oscilloscope, Logic Analyzer and Signal Generator for the Raspberry Pi. As it connects via USB and there is software for Windows, Mac OS X and Linux available it can be used on this systems as well.
The guys at emlid have developed Navio a navigation/flight controller sensor shield for the Raspberry Pi targeting robotic models like cars, boats, submarines, multirotors and planes.
With a lot of projects in the field of flight/navigation controller hardware moving away from 8-Bit to 32 Bit MCU for better performance, it seems that it was about time that someone developed something like that for the Pi. While you would think that it’s generally a bad idea to have a control loop running in a non-realtime environment, realtime kernel extensions like for example Xenomai make things like this possible and manageable. All while running in a linux environment with all the features of an OS and the command line magic of the tools you love available at your fingertips.
In case of the Pi you have the added benefit of comparatively large processing power that makes things like streaming video of a camera or even running image recognition on top of it possible, especially if you incorporate the GPU.
Apart from that the possibility to for example add Wi-fi or 3G connectivity by simply plugging in a device into the USB port seems also a plus.
This are the features the shield adds to your Pi:
13 PWM outputs to control servos
9DOF inertial measurement unit
Pressure and temperature sensor
GPS with carrier phase measurement
External GPS antenna
4-channel 16bit ADC
1 trillion read/write cycles FRAM. An interesting feature as in my experience the SD card read/write access, if necessary, is often a problem if you want to achieve realtime performance.
Bright RGB LED
I2C, SPI, UART ports.
On the software side of things emlid is planing to port ArduCopter to the Pi.
Broadcom recently announced the release of full documentation for the VideoCore IV graphics core, and a complete source release of the graphics stack under a 3-clause BSD license. This is good news for the Raspberry Pi community. The release targets the BCM21553 cellphone chip, it should be reasonably straightforward to port this to the Pis BCM2835, allowing access to the graphics core without using a binary blob.
As an incentive to do build a open source video driver the Raspberry Pi foundation will pay a bounty of $10,000 to the first person to demonstrate that they can successfully run Quake III at a playable framerate on Raspberry Pi. This competition is open worldwide, and you can find competition rules here which describe what you have to do, and how to enter.
BitTorrent Sync is what seems to be a great encrypted serverless Dropbox alternative. You can read more about the technical background here. It provides clients on OSX, Linux, Windows, Android, iOS, ARM and others. The client for ARM can easily be run on the Raspberry Pi. Just download the binary and copy it to your pi. Start it by executing “./btsync”. You can now access a web interface at http://[raspberry IP]:8888/gui. This interface allows you to create new “Shares” or connect a local folder to and existing one.