If you’ve been in the xr creator community for a while you might remember the modeling tool Blocks from google. I remember getting really into creating worlds with it (I’ll need to dig up some sketches) but Blocks went silent a while back and not a lot of actions has happened since. But! today they announced that they have moved Blocks to be open sourced, hence the rebrand of OpenBlocks 
This is really sweet to see as we’ve seen the success of Tiltbrush live on through OpenBrush. More opensource goodness ya know @jsdbroughton
@Johan shared this a few moments ago and I figured some peeps in the community would like it 