Is there any Free FTP Extension?

I am looking for free FTP extensions. The reason is I am going to make a FTP app.
Is there any free ones?

If there is one then you'll surely find that here:

A long time ago I made an FTP client extension, it's only experimental, the blocks are in Spanish, it's not adapted to Android >9, if you want to try it...
http://kio4.com/appinventor/274_extensiones_clienteftp_hora.htm

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