The Mali G31 is used in some pretty cool ultra cheap devices. Getting good mainline support for this GPU is really cool because of these ones :)
The Mali G31 is used in the Amlogic S905X{2,3,4} SoCs. You can buy a "TV box" with a quadcore Cortex A53/A55, gigabit ethernet, 4GBs of RAM and 32GB of eMMC storage for $30-50 delivered. Think of them as Raspberry Pis with included storage, case and power supply, preassembled. I wouldn't recommend them over a Raspberry Pi right now - getting a non-embedded GNU/Linux distro running on them properly is not easy - but these developments can change that. Right now it's probably better to spend some extra money on the Odroid C4 with the same chip and some accessories, because of the better community support.
The Mali G31 is also the GPU used in the Rockchip RK3326 in the Odroid Go Advance, a $60ish open source tinkering gaming handheld kit from Hardkernel. The first Chinese clone of this device was released for this with the same chip, so there's some indication the RK3326 will become a standard platform for retro emulation hardware. Pretty old MIPS chips were the standard for that until this year still, because the hardware follows software support.
The Mali G31 is used in the Amlogic S905X{2,3,4} SoCs. You can buy a "TV box" with a quadcore Cortex A53/A55, gigabit ethernet, 4GBs of RAM and 32GB of eMMC storage for $30-50 delivered. Think of them as Raspberry Pis with included storage, case and power supply, preassembled. I wouldn't recommend them over a Raspberry Pi right now - getting a non-embedded GNU/Linux distro running on them properly is not easy - but these developments can change that. Right now it's probably better to spend some extra money on the Odroid C4 with the same chip and some accessories, because of the better community support.
The Mali G31 is also the GPU used in the Rockchip RK3326 in the Odroid Go Advance, a $60ish open source tinkering gaming handheld kit from Hardkernel. The first Chinese clone of this device was released for this with the same chip, so there's some indication the RK3326 will become a standard platform for retro emulation hardware. Pretty old MIPS chips were the standard for that until this year still, because the hardware follows software support.