Benilton02 wrote: ↑Sun Apr 14, 2019 4:03 am
...but in my application the Raspbian is very slow. Then, I need another system.
Raspbian is actually one of the faster operating systems. You're not going to gain much with another OS.
What is it you think is very slow?
Which model of Raspberry Pi?
What are you using for a power supply?
Have you tried an "A1" rated micro SD card?
Benilton02 wrote: ↑Sun Apr 14, 2019 4:03 am
What free systems can indicate for me for commecial applications?
Most versions of Linux are available for free, but are covered by various licenses (typically GNU, but often others as well). For commercial use you would need to examine all the license terms and conditions, including additional software. For example, the full version of Raspbian includes things like
Oracle Java and
Wolfram Mathematica (plus other educational and productivity software) that each have their own licenses. The Lite version avoids most of that.
Since Raspbian is based on Debian, start here:
https://www.debian.org/legal/licenses/
There should be something additional for the proprietary Raspberry Pi binaries (check raspberrypi.org).
To give you more specific answers we'd need to know more about what you are doing.