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"B4R is a 100% free development tool for native Arduino and ESP8266 programs.
B4R follows the same concepts of the other B4X tools, providing a simple and powerful development tool.
B4R, B4A, B4J and B4i together make the best development solution for the Internet of Things (IoT). "
Full disclosure: I am not affiliated with the company but I do use their B4A (paid) and B4J (free). They do have a great user forum for samples and help.