This one looks really good, if you've got an Android device. I'll be trying it out when I get back to the States.
https://play.google.com/store/apps/details?id=org.pottssoftware.agps21&feature=search_result#?t=W251bGwsMSwyLDEsIm9yZy5wb3R0c3NvZnR3YXJlLmFncHMyMSJd
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