Proxychains

Proxychains is a program that chains together different proxies and uses them on any program you want.
For example you can use proxychains for run metasploit with TOR (proxychains msfconsole) or using a vpn with TOR
You can install proxychains with : sudo apt-get install proxychains
If you use arch you can install from AUR
Now if you want, you can change your proxychains.conf , adding to [proxy list] a proxy that you want for example : socks5 127.0.0.1 9050 (for tor)
Now you can use proxychains with all program for example openvpn, nmap ecc..

If you have any problem or if you need some explanations just write under this post!