If you're looking for a 360 Degree Feedback software tool, the best option is to find one that is provided on a 'software as a service' basis. This means you can 'rent' out the software and the platform as and when you need it. You shouldn't be forced into making long-term commitments, so check the different providers before you buy.
The software should be easy for you to set up and manage, and not require any technical or software skills to do so; templates for 360 questionnaires, emails etc should be provided which you can simply overtype to put in your content.
A fully customisable product should allow you to use your own organization's competencies and values, and also give you some sample questionnaires so you have a starting point.
Your software provider shoul...