Thanks for all the recommendations so far, but maybe I've not specified what I needed clear enough. You've all recommended me programs to make slideshow. The software I am looking for is to join a continuous sequence of photographs into a, something like, fast forward movie, when everything is accelerated in motion. For example, like watching a plant grow in real life will be very slow, but if I can take a time-interval sequence of photos, then join them up into a movie, then we can watch the plant grow, maybe in 1 min. Not sure what I should call this kind of software. Any advice? Sorry for not being specific enough.