We tested a bunch of FTP clients for iOS devices and found these to be the best. Most of them cost between $1 to $5 but we found the small price to be worth it. We do not endorse the use of any of them, we just tested them all with a starter cloud hosting plan from Thexyz and they worked well.
Seems actively developed with full upload and download via email client and device on iPad and iPhone. View text files (doc, txt, rtf, pdf, pps, xls, etc). Edit simple text files (txt, css, php, xml, html, csv, htm, etc)
Easy FTP has a nice text editor which editing documents with the SFTP client for iPhone/iPod Touch.
A nice app that works really well with the iOS, all the features you would expect are also available.
FTP Sprite can turn your iPhone, ipad, ipod into ftp client, download files from ftp server and upload files into ftp server.
Optimized for iOS 7 : Fully redesigned to embrace the fresh new look and feel.
FTP Browser is currently the only iPhone, iPod, or iPad ftp web browser available.
Upload and Download files to your device via FTP/FTPS/SFT.