Hello Frank,
Is there a version already available that has some data in it?
Not yet, though you can upload data of your own (quota is minuscule though, this is just a development install after all).
Where can I find information about the meta data that is collected together with the simulation data?
The idea is to support the LIGO data format for waveform files. Documented here: https://arxiv.org/abs/1703.01076
We (the NCSA gravity group) are working on expanding and combining existing python and Mathematica (that being Ian Hinder's simulation tools) scripts into a single python script that would take a Cactus simulation and do all the steps to produce a LIGO hdf5 file with the waveform and which should work without problems on typical clusters.
For other types of files (ID data, checkpoints, stuff) it is less clear yet what type of metadata to support.
Yours, Roland