A lot of work was done in FAKE 5 to change the core runtime and make it more flexible. The first part of this talk shows how people are already using the new options. The second part shows various ideas on what's possible now and where to go next and additionally try to recruit or inspire potential contributors and/or get early feedback.
FAKE: https://github.com/fsharp/FAKE/
Xake
Deployments with FAKE
"Deployment-Package" New DSLs GUI?