New to Fedora 16 is ckermit, an updated implementation of the venerable Kermit file transfer program. The Kermit protocol is available on almost all architectures, so may well be the file transfer mechanism of choice when dealing with a less capable platform. The project's websit is http://www.columbia.edu/kermit/ck90.html.
ike is a free IPSEC VPN client can be used to communicate with Open Source IPSEC VPN servers as well as some commercial IPSEC VPN servers. Version 2.1.7 is included in Fedora 16. http://www.shrew.net/.
qodem is an open-source re-implementation of the DOS-era Qmodem serial communications package, updated for modern systems. http://qodem.sourceforge.net/.