This blog is licensed under the GPLv3, with help from a template.
That template is licensed under the CCA 4.
Most of our software (on our github page) is licensed under either a GPL, BSD, or MIT license.
The WPILIB programs/utilities used to develop in Java, C, C++, and LabView can be found here, and are licensed under the BSD.
For reference, any code compiled on this blog will be using either Oracle JDK/JRE 8u101, or OpenJDK 8uDEV, and using GCC (gcc/g++) (Linux) or Clang (Apple).