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esp8266 json url
http://arduino.esp8266.com/staging/package_esp8266com_index.json

For OSX
step 1:  open Arduino --> preferences --> settings --> Additional Boards Manager URLs
step 2: copy esp8266 json url and paste to text box of Additional Boards Manager URLs
step 3: click OK to save, and close preferences window
step 4: Tools -> Board: -> Board Manager -> Type "ALL" and key in "8266"
step 5: click install button to install package of esp8266 by ESP8266 Community
step 6: wait to download and install
step 7: check your version of 8266 and select your board to use



http://goods.ruten.com.tw/item/show?21750410032162


xPUD linux distribution

https://zh.wikipedia.org/wiki/PUD_GNU/Linux