http://bumblebee-project.org/
https://github.com/Bumblebee-Project/Bumblebee

# hidden link (use this one)
http://bumblebee-project.org/bumblebee-3.2.1.tar.gz

# where did jgeboski find this link?
use wget's --content-disposition flag
https://github.com/Bumblebee-Project/Bumblebee/archive/v3.2.1.tar.gz