Any change since 2013?
SGX 5xx series, by Imagination : used within the OMAP4 line of processors as well as in other products (including some Intel APUs). No spec, no driver source, binary blob only. The same goes for other Imagination GPU - including the recent 543 MP4+ (PS Vita). No good news for the 6xx series. Texas Instrument was trying to negotiate with Imagination to release some source code but that discussion most likely failed (TI announced they will not make any other CPU, meaning that Imagination has no incentive to free their source code).