CasparCG is an open source graphics and media server originally developed by a team at Sveriges Television in Sweden, and further developed with the help of programmers and users across the globe. CasparCG provides the actual graphics and media processing behind the scenes for WAGS.
CasparCG is command line driven, and does not have a graphical interface built in. WAGS provides the graphical interface and adds additional features that build on the power of CasparCG.
CasparCG is licensed under GNU GPLv3.
More information about CasparCG (including the source code and documentation) can be found at www.casparcg.com.