Inspired by this.Not F1 as such but Project Brabham was a crowd-funding "scheme" to get a Brabham LMP2 car in the WEC for 2015... that didn't happen.
They had plans back then of creating a LMP1 car and there was talk about F1 involvement with perhaps a buyout of Force India.
There doesn't appear to have been any real progress in the eight years since the project was launched although the company have created the BT62 and BT53 models since then.