I've got:

Jazz Jackrabbit 1 (All episodes)
Jazz Jackrabbit 2 (1.21)
Jazz Jackrabbit 2 Patch (1.23)
Jazz Jackrabbit 2 TSF (1.24)
Jazz Jackrabbit 2 CC (1.24+)

Ehhhm... What's 1.20 OEM/beta?

And is it fun

Jazz Jackrabbit... secret version sounds cool