[url]http://www.jcraft.com/jsch/[/url]
It uses BSD-style license (free and pretty much can do what you want
with it).
It is a Java library on top of which you could create IS services for
use in your integrations. The company I work for did this sort of thing
with a different library and the approach is effective.
If you’re comfortable with creating and maintaining Java services then
using JSch can give you the functions and flexibility you want. The
only downside is you’ll have to do some work to hook the library into IS.
#webmethods-Protocol-and-Transport#webMethods#Integration-Server-and-ESB