What's a good way for me to reduce tension with one of my coworkers?

beer after work

beer after work

Have a vent session and try to find solutions

tactfully confront and discuss

Find out what the difficulties are. It is a computer/software issue? (or any other tools that are used for the job). Communication issues? Stress from work or from personal life? Are they just overwhelmed?

Address the situation head on, see if you can get to the root of the issue and go from there

Keep your distance and do your job

Communication - Don't gossip to other coworkers.

Do something non-work related to ease tensions - lunch, a volunteer effort, etc. Get to know each other personally. People who know each other well work much better together and understand their perspectives.

Be more objective. sPend more time with them and try to rationalize differences.

Ask for their advice about something, or inquire about something personal that you've heard them talk about in the past. Example: "I recall you saying your daughter was applying to several colleges. How did that end up?"

Depends on the personality. For backstabbers, address face to face with witnesses. For all others try to understand where the tension is coming from.

Have a frank conversation and ask them if you did something that has lead to the level of tension in your relationship.

Relax yourself

Do not talk to them unless you absolutely have to.