Doesn't say specifically, but from following the links at the end of the post, it seems they are either financially sponsoring the developer(s), and/or donating

Doesn't say specifically, but from following the links at the end of the post, it seems they are either financially sponsoring the developer(s), and/or donating time of their developers, and/or some other logistical support (space to work in their office, access to servers or resources for testing, etc).