The MiniUPnP project offers software which supports the UPnP Internet Gateway Device (IGD) specifications.
light Unix download accelerator
cURL is a command line tool for transferring data with URL syntax
iodine lets you tunnel IPv4 data through a DNS server. This can be usable in different situations where internet access is firewalled, but DNS queries are allowed.
NAT-PMP is the direct concurrent to the UPnP IGD specification. It is providing a way to do NAT traversal. It is part of the Bonjour protocol specifications.
The mDNSResponder project is a component of Bonjour, Apple's initiative for zero-configuration networking.
neon WebDAV library
Network Time Protocol suite/programs
OpenSSH (OpenBSD Secure Shell) is a set of computer programs providing encrypted communication sessions over a computer network using the SSH protocol
OpenVPN is a robust and highly flexible tunneling application compatible with many OSes.
UNIX port of the famous Telnet and SSH client
File transfer program to keep remote files into sync
Wput is a command-line ftp-client that looks like wget but instead of downloading, uploads files or whole directories to remote ftp-servers.