Amlogic

Amlogic, Inc. is a US-based company which produces AML8726-M SoC (65nm) with single-core 1GHz Cortex A9 CPU, ARM Mali-400 GPU, and 1080p VPU.

Amlogic OpenLinux ARM Wiki, but be noted that platform SDK != tablet producer SDK, so you will have lot of troubles when trying to run it on tablet because of both code changes and missing drivers.

List of popular Amlogic AML8726-M SoC based tablets