draw.io - Online diagramming application
PTE AV Studio - Create photo and video slideshows with effects and styles.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
ProShow - ProShow is a dedicated tool for creating slide shows from your photos, video and music.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
LightMV - LightMV is the best free online service for you to make a video using photos and music.