Mac OS X: If you've ever used two cameras or tried to sync up the photos from your camera and that of a friend, you know what a frustrating experience it can be. ShootShifter makes merging batches of photos painless.
When you're organising photos you can run into all sorts of issue: pictures taken by a camera with a clock that isn't set correctly, pictures taken at the same event but from two different cameras that have mismatched time stamps, pictures taken with two different cameras that have the correct time but have different file-naming schemes, and so on.
ShootShifter makes it incredibly easy to correct these problems. Once you import pictures into ShootShifter you can modify them either by dragging and dropping them on a timeline or by modifying the actual time stamps. You can tweak individual images or bulk shift the time stamps of entire folders and collections. You can also standardise the naming scheme so that photos from Camera A that are in DSCXXXX.jpg format and photos from Camera B that are in P1020XXXX.jpg are all unified with a name like EventXXXX.jpg.
ShootShifter is freeware and requires Mac OS X 10.4 or above. Have a favourite tool for syncing your photos up? Let's hear about it in the comments. Thanks Mortimer!