Not saying it's cheap but https://lightform.com/. - Source: Reddit / about 2 months ago
Snap Art - Snap's augmented reality platform
8th Wall - Cross-Platform Mobile AR
echoAR.xyz - A cloud platform for augmented and virtual reality (AR/VR) apps and content
Metaverse - Democratized augmented reality platform: AR for everyone!
Sketchfab - Sketchfab is an industrial design software tool is useful for ideation and for beginners in the industrial design field.
Apple ARKit - A framework to create Augmented Reality experiences for iOS