These are very useful utilities — they convert TUN/TAP to Socks or HTTP Proxy, allowing to use VPN as a proxy (OpenVPN as Socks5), does not require root privileges.
tunsocks is a user-level SOCKS, HTTP, and port forwarding proxy for use with VPNs that typically interact with tun devices. Rather than passing bytes to and from the tun device, they can pass the data to and from this user-level program. tunsocks is implemented using lwIP.
Additionally, tunsocks provides connection sharing via NAT.
ocproxy is a user-level SOCKS and port forwarding proxy for OpenConnect based on lwIP. When using ocproxy, OpenConnect only handles network activity that the user specifically asks to proxy, so the VPN interface no longer “hijacks” all network traffic on the host.