Standards (other than ZigBee) built on 802.15.4

Besides the ZigBee protocol stack, are there any other upper-layer standards built on IEEE 802.15.4? Thank you!

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A number of manufacturers are building their own internal network- and application-layer protocols on top of IEEE 802.15.4, but as for published non-proprietary standards, we only know of ZigBee to date.

This was first published in May 2004