Linux onboard

RT5350

VoCore: http://vocore.io/store/index

Ingenic M150

Halley Development kit

http://www.ingenic.com/en/?newton/id/7.html

MTK MT7620N

http://wrtnode.com/

Qualcomm Atheros AR9331 SoC

http://www.black-swift.com/

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Non OS

ESP2866

An interesting option based on negligible pricing.

Restricted in sockets, but still possibly useful.

Interesting firmware options, either download to unit itself (SDK available) or for simple applications/ 2 x Node Lua variants:

Example apps, seems to fit a lot into ESP2866:

http://harizanov.com/2015/02/wifi-thermostat-with-weekly-scheduler/

http://harizanov.com/wiki/wiki-home/three-channel-wifi-relaythermostat-board/

http://nodelua.org/

http://www.electrodragon.com/?s=esp8266&post_type=product

So, have some ordered and will see what can be done with these.

EMW3165

Looks very good on paper just waiting for GCC support

Limited toolsets available, limited information.

Ordered a couple + dev board