Simple C code with iptables make this tool proxifier which tunnels whole system traffic through the proxy server, without configuring individual application

Linux applications proxifier

Force applications to use Tor for network connections.

An open-source alternative to proxifier

proxychains ng (new generation) - a preloader which hooks calls to sockets in dynamically linked programs and redirects it through one or more socks/http proxies. continuation of the unmaintained proxychains project. the sf.net page is currently not updated, use releases from github release page instead.