Is the WSFed Gibbon?

No! The WSFed was founded by people from within the close circle of Gibbon Slacklines.
In early 2014, however, the decision makers of Gibbon lay down their offices in the WSFed and with effect of Dec. 31 2014 the partnership with Gibbon ended.
The two board members of the WSFed are not working for Gibbon anymore since the end of February 2015. Read the full story here.