Yesterday I learned that Games Done Quick use open source software for their broadcast graphics. The person responsible for developing the layouts and some of the software involved has done a video series on their GDQ layouts system, and GDQ open sources their broadcast layouts each year.
(as someone who is into broadcast design, this is extremely my shit)
(some of you may be horrified to hear this, but they use Electron for part of it)
@dzuk i just found out they had a video series for the 2017 layout as well 👀 https://www.youtube.com/playlist?list=PLTEhlYdONYxv1wk2FsIpEz92X3x2E7bSx