Comment by tredre3

The closest direct competitor is Bouffalo Lab's BL6xx chips, which do bluetooth and wifi and have an open SDK. Their documentation is very poor unfortunately (at least in English).

Otherwise NXP recently released their RW6xx line with wifi/bt/thread/zigbee. But as with any other western maker, the documentation and SDK aren't as easily accessible to mere mortals (but I think NXP in particular has gotten better with this).