title: Constraint programming framework for scheduling problem
body: <p>I'm going to work on a software application for project planning and I’m looking for a constraint programming library that supports interval arithmetic and constraints on real numbers. </p>
  
  <p>The feature I have to implement is the scheduling of project.</p>
  
  <p>Could you advise me a constraint programming framework for such problem?</p>
  
  <p>Thanks in advance!</p>