Elastic Path Software: How To - Building Enterprise Apps with Open Source Frameworks. Any software developer worth the price of their iPod will tell you that 'reusability' is one of the Holy Grails of software development: it is incredibly valuable, but equally as elusive. How many developers working on insane deadlines have time to sit back and think about all the wonderful ways that their business components 'might' be used in the future? Even standards committees led by industry experts have trouble with this.