NI Raum reverb is still free

[Fleer]

One of the best NI effects. 
Raum (still free)
https://www.native-instruments.com/en/products/komplete/effects/raum/

[satya]

always free

[Francisco-J]

And it will continue to be free for a long time, as it now comes inside Komplete Start, Native Instruments' starter bundle, which also includes:

effects: Ozone EQ , Trash Lite , Supercharger , Replika , Guitar Rig 7 Player , Vinyl & Raum

instruments: Hypha , Analog Dreams , Ethereal Earth , Jacob Collier Audience Choir , Irish Harp , Yangqin & Factory Selection 2

 

https://www.native-instruments.com/en/products/komplete/bundles/komplete-start/