You'd have to ask whoever installed it why it was installed, but it should be safe to remove based on the forum here: configuring a computer with opendns agent It is
How to Change DNS Servers on Mac to Google or OpenDNS Change DNS Servers on Mac to Google or OpenDNS. Follow the steps below to change the DNS servers on your Mac. 1. Click on the Apple Logo from the top menu-bar on your Mac and then click on the System Preferences… option in the drop-down menu. 2. On the System Preferences screen, tap … how do i get rid of OpenDNS? | Yahoo Answers May 10, 2009
How to setup OpenDNS on network or local machine - YouTube
I know I can change the DNS to 22.214.171.124/126.96.36.199, but I want traffic to still come out of my computer (just only my work-related online work), in case they are looking at user usage. So, Tor seems like a good option-->personal browsing is hidden, but I still have work browsing, so nothing looks fishy. What is OpenDNS? Why should I use it, and how? - pcWRT May 06, 2015 Who uses OpenDNS and MySpace? | Wilders Security Forums
Since I upgraded to Firefox 4.0, I have been having problems connecting to my webmail. I get a message from OpenDNS saying the server is not working. Upon contacting the email provider, I am told that is not the case. Where did OpenDNS come from and how did it appear on my computer? I have not made any changes to anything except to upgrade Firefox.
Oct 14, 2012 Setup Guide | OpenDNS Thanks for choosing OpenDNS! To get started, you’ll need to set up one or more of your devices to use OpenDNS’s DNS nameservers. For instructions on how to do this, choose your device type from one of the categories below.