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Aglets is one of mobile mobile agent platform. Mobile agent is a fundamental technology of software development, just like Object-oriented programming or Functional programming. So, your question is similar to "What is Object-orientd programming?" or "Is there any sample apps of Java API" :). Unfortunately, mobile agent technology is in research step, so, showing a practical sample of mobile agent may difficult.
Because this techonology is in research step, not in practical use step, there's no "competition", but, as a "congener", there is(was) "Telescript" (made by General Magic). —Preceding unsigned comment added by 18.104.22.168 (talk) 17:02, 10 May 2010 (UTC)