The Linux Foundation's CommunityBridge platform

The Linux Foundation has announced
a new initiative called CommunityBridge; its purpose is to
help with funding and support for open-source developers. It includes some
security-related services and a means for connecting developers with
mentors. The program is in an 'early access' mode for now.

The Linux Foundation is not the first to provide such services, of course;
see this
statement from the Software Freedom Conservancy for its take on this
new initiative.