how to rotate image files of GENERIC angles?

[Marco Fioretti]

Hello all,
I am scanning lots of A4 sheets with 6/7 small photographs glued on each side. The problem is that most of those photographs, were deliberately NOT glued parallel to the sheet edges, and often each at a different angle
So to get images that display well on screen I should crop every image, ROTATE it so that the bottom side is "horizontal", and then crop it again.
The problem is the rotation. I Have searched before posting, but only found tools like jpegtran that only rotate of multiple of 90 degrees.
What I would need, instead, is any Linux-compatible tool to which I can say "rotate this file N degrees", for every N integer between (at least) 0 and 90.
Suggestions? CLI or GUI is the same, albeit I'd prefer a command line solution.
TIA,
                Marco
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