Here is a link to this resource: http://communities.vmware.com/docs/DOC-10772
Above document is a list that will be open to the community to edit and view where a third party that has tested their script/agent on vMA can add their Agent/Script to the list.
The sole purpose of this document's is to make it transparent to the community on which agents/scripts are compatible with vSphere Management Assistant(vMA) that are created by Third Party.
Hence if you are a third party that wants to publish that their agent/script is vMA compatible, this is the place!
Note: Maintenance of this document is a community effort and VMware does not endorse or imply support for any of the agents/scripts listed.
This is simply a way for people to keep track of what's worked on vMA.
The SDK Team.