Some of these may be totally free but some just give you a free trial.
· Ispiring free – Powerpoint to flash converter
Slideshare - post your slideshows and share
Comic Strip Creators:
"Access to image-based resources is fundamental to research, scholarship and the transmission of cultural knowledge."
Apps & Demos for viewing and working with IIIF compatible images
These are open source or free presentation or visual tools. Most require you to register and some are available for free for a trial period