Developer of EmberGen / LiquiGen / GeoGen here.
EmberGen = real-time smoke/fire/explosions/particles (and simulated the GeoGen logo unveiling).
GeoGen = real-time terrian editor
LiquiGen = real-time liquid simulation
The GeoGen logo reveal video just used a simple particle simulation to inject smoke. Nothing too fancy.
We have a live stream going on tomorrow at 12:30PM EST to showcase all of our latest R&D on all tools:
And as for what we'll be showing tomorrow on stream. Real-time photo-realistic liquids with real-time meshing as seen above in the splash image.