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.
daten.berlin.de provides access to berlin specific open data sets.
It features :
32-bit Cortex-M3 LPC1769 with 512kB flash and 64kB RAM
3 to 5 A5984 stepper drivers with 1/32 microstepping
Thermistors and mosfets to control heaters and fans
Ethernet and USB connections
SD card to store configuration and Gcode files
Various inputs and outputs for extensibility
Tox. is an encrypted Open Source Skype alternative.
Jitsi is a Open Source alternative for skype. It supports chat, audio and video conferencing.