A competitor is someone who competes. A collaborator is someone who works with someone to achieve some plan, sometimes with what someone who may normally be the enemy.
It actually means this. Someone who works jointly on an activity.
There are many good places to find a code collaborator. One can find a code collaborator at popular on the web sources such as Smart Bear and Code Ranch.
Partner or collaborator.
Someone who co-operates secretly with an enemy occupying force
a collaborator
Collaborator - novel - was created in 2003-09.
More Than A Poke In The Eye With A Sharp Stick
quisling
what makes someone a good explorer
Deterrent means to make someone not make someone feel good to do something for them
infidel