write to SD card without using IDE

Hello and my apologies if this has been answered elsewhere.

I'd like to know if there's and easy way to upload a file to the WWW folder on the SD card without reuploading the whole sketch from the IDE and without removing the card each time.

Can I use SSH or ftp?

It would be nice to copy it quickly every time I make a small edit to test.

Thanks!

sftp works!