File Juicer
File Juicer for macOS
Overview of Formats

Search & Extract

Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats

key - Apple Keynote Files

File Juicer will extract the images from Apple Keynote files.
Recovering the text from KeyNote files can be done (without formatting), but so far I have not gotten any feature requests. It is hidden in the many text files which are extracted, and if you search in them it is hidden in a lot of xml code.