This is the ErgoDox EZ, or more specially the ErgoDox EZ Shine. The ErgoDox started, and remains, an open source keyboard project initiated by Dominic "Dox" Beauchamp to satisfy the need for a fully customizable, ergonomic, split keyboard (hence the name). It was met with great interest in the enthusiastic keyboard community in the early 2010s, and especially from writers and coders alike.