while strictly PC boards, some Amiga applications directly support them as framebuffers through a BridgeBoard with Janus software
Caligari Broadcast has native support for the Targa boards (including saving in Targa format, automatic transferring through the BridgeBoard and loading the image into the Targa framebuffer)
Sculpt renders directly through the Sculpt-Direct and Targa-Direct (TGALink) modules of Active Circuits' ImageLink software
the various Targa, Targa+ and ATVista boards can do much more than displaying 24 bit images in their framebuffer, but those features (capture, live overlay, keying, etc.) are not utilized by Amiga applications