Gentle Alarm is by far the best but it costs money for the pro version, IMO its worth it though.
You can make as many alarms as you want, control how long they last, what ringtones you want to use for each one, and even use the "fade" option which introduces the alarm progressively rather then suddenly while controlling how long you want the alarm to fade in.
For example my LD alarm is as follows:
Alarm rings @ 4:00 AM
Alarm Length - 30 Seconds
Alarm volume - 80%
Fade in volume from - 0%
Fade in Length - 15 seconds to reach 80% volume
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