This is a very versatile tool which is available online for free: from Klaus D. Goepel at BPMSG.

There are two phases in the process.

  1. Generation of criteria and weights
  2. Evaluation of options

The link gives a web-based interface to set up an AHP problem, and evaluate in a group.  A very useful aspect of this implementation is the user feedback on the Consistency Ratio (CR).  And most importantly, the advice on which user inputs are not consistent.  I think this helps the user re-evaluate and think about the input they put into the pair-wise comparisons, resulting in better and more accurate weights.

This is a very versatile decision support tool.