The Ameba Software Serial related APIs and examples are works based on libraries formerly known as NewSoftSerial.h by Mikal Hart (http://arduiniana.org/libraries/newsoftserial).
These include,
SoftwareSerial.cpp
SoftwareSerial.h
These libraries are under GNU Lesser General Public License.
The Ameba GPS related APIs and examples are works based on Adafruit GPS library written by Limor Fried/Ladyada for Adafruit Industries (http://www.adafruit.com/products/746).
These include,
Adafruit_GPS.cpp
Adafruit_GPS.h
These libraries are under BSD License.