Plask
Plask supports frame-by-frame, skeletal, motion-capture, or real-time effects work with outputs suitable for common game pipelines.
Why use it
Animation and technical-art teams can use it to perform markerless capture, retargeting, and animation previz in a browser.
Where it fits
Use art, animation, audio, levels, and narrative to make the game easy to read and its world convincing.
What to check
The free tier is tightly limited, commercial use requires the matching plan, and filmed performers must consent explicitly; Production delivery still requires checks for frame rate, rigs, alpha, loop seams, and engine compatibility.