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

.db - Database files

Is used by several software packages like Safari for its cache files, Subversion and Movable Type.

Apple Mail and Safari's cache databse has in sqlite3 format on macOS and the .db extension is getting more common.

See the general File Formats page.

You can install Berklery DB tools with Homebrew