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Atmel START. Data Visualizer. Ensemble Graphics Toolkit. Browse Microchip Studio for AVR® and SAM Devices. Atmel Studio Downloads Archive.
Atmel - Wikipedia
https://en.wikipedia.org/wiki/Atmel
Atmel Corporation was a designer and manufacturer of semiconductors before being acquired by Microchip Technology in 2016. It was founded in 1984. The company focuses on embedded systems built around microcontrollers.
START
https://start.atmel.com/
For more information on how to use Atmel START, read the Getting Started guide or watch our video tutorials . For general documentation about how to use Atmel START, see the user guide.