Arduino now has an officially supported command-line interface. The project ... build process to other IDEs more easily. The code is open source, but they do mention in their official announcement ...

for instance Arduino, you would need atleast 6 I/O pins to talk to the LCD. However, if you use an LCD module with I2C interface, you only need 2 lines to process the display information. Now a days, ...

From launch, Arduino was a complete hardware and software ecosystem, allowing users to immediately start programming code in a free, simple-to-use, open-source integrated development environment ...