3DS Max News - unofficial - SideFX has announced that Houdini Engine for UE4 and Unity are now available for commercial customers for free. Previously the engines were free Houdini Indie customers,
Houdini Engine for 3ds Max: Modifier Assets
初心者向けHoudiniトライアル005】Houdini Engine for MayaでHoudini デジタルアセットを使用する – Born Digital サポート