We all know the problem about proprietary software is lock-in danger. How can you ever be sure, that whenever you would like to move away from a certain type of software, you are able to do so. What guarantee is there that the data managed by these softwares is yours and not owned by that application.
A new initiative, called Certified Open, will allow companies to rate their products in terms of openness. Giving you some kind of confidence in that it at least complies with certain standards. It appears there are 3 different levels; bronze, silver and gold, though I could not find any reference to what it entails.