The WorkFlow effort created some components for Plasma 5 in order to enhance their workflow using Activities and WorkAreas. This project produced the following:
WorkFlow Plasmoid:
[kdelook.org]
[github.com]
WorkFlow KWin Effect:
[kde-look.org]
[github.com]
WorkFlow KWin Script Launcher:
[www.kde-look.org]
[github.com]
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I stopped maintaining the WorkFlow Componets around 2014. Plasma 5 brought a new air in Activities and for me the new components and approach is more than enough. I dont know how much but I believe at a point the WorkFlow project helped a bit in demonstrating how Activities can make a user's life easier... :)