Two out of three of mine had colic, so I tried loads of things, without any real sucess I am afraid, but in case they are helpful here goes:
Put baby over lap and massage back while gently jigging your knees
Over your shoulder is a well know one, I always found going upstairs with baby over shoulder worked well at getting air up
Baby massage is good, various techniques for soothing tummy pain
Sit baby on lap, support their front with your flat hand, and their back and shoulders with other hand, gently rotate them.
If colic is caused by baby taking air in as they feed, you may have a gulpy baby or a fast let down, try feeding lieing on your back to diminish your let down.
If you have one of those swing chairs, they really can work, highly recommended by some. I find mine useful, except that dt1 would often slump too much and I would fiddle with him and then he would wake up
Dancing to Abba, or anything suitably cheesey
BFing a lot, as this seems to comfort them, although some evidence to say that too much can cause colic, still it was the only thing that stopped my two from crying.
Can't remember any more, but just hang on to the fact that colic nearly always dissapears around the 12th week, so not too much longer to go.........