Plywood is a new C++ based cross platform C++ framework created by Jeff Preshing, who previously worked at Ubisoft Montreal. Plywood is composed of 3 primary parts, a project build/management system, a C++ reflection and serialization system and a collection of modules to provide low level functionality needed by all games. Plywood is open source on GitHub under the MIT license.
Details about getting started and building Plywood are available here. If you need help or are interested in learning more, the Plywood Discord server is available here. You can learn more about the Plywood framework in the video below.