Empressr - Empressr is a free multimedia tool that is virtually effortless to use. The tool creates, manages, and shares slide shows without limitations.
VoiceThread - With VoiceThread, teachers can create dynamic multimedia slide shows for students or colleagues to comment on. Comments can be made through microphone, telephone, audio file, text, or video.
SlideShare - SlideShare is the world's largest community for sharing and managing presentations. The site allows you to upload presentations to the public or a private group of people.
Slideroll - This site offers free software for creating smooth slide shows that can be viewed by anyone with Internet access. Created slides can be published on the site or embedded in web pages, blogs, or emails.
PhotoPeach - PhotoPeach is a slide show creator that uses photos, text, and audio. This is a great tool for teachers who want to create entertaining slide shows within minutes.
Joggle - This free beta site allows users to manage and share photos, music, and video. Joggle provides the tools for quickly embedding slide shows into websites, blogs, and more without the use of complex coding.
Yugma - Teachers can use Yugma to upload and share presentations, collaborate in real-time, or host a web conference. This site makes it incredibly simple to make educational presentations for students.
Animoto - Animoto is an easy-to-use slide creator that offers unlimited videos to teachers. Within minutes of signing up, teachers can start creating custom slide shows of images, audio, and text. This site can also rearrange your photos to create a new slide or custom video.
Slide - This interactive presentation site features tools for creating slide shows, posting video, and creating an online group.
One True Media - One True Media offers a free subscription for teachers who want to upload and share images, music, and videos. This site also features special effects for a dynamic, personalized touch.
Vyew - This free web conferencing site provides tools for hosting presentations, webinars, or online meetings. Vyew also allows teachers to upload and create real-time courses and collaborative learning.
Vcasmo - Vcasmo is a rich media presentation solution designed for personal use and academic teaching. As soon as you sign up for a free account, you can start uploading images, audio, and video to create a personalized presentation or simply publish a pre-created PowerPoint presentation.
LectureTools - LectureTools is a free lecture and slide tool that can be used to engage students in lectures. The site provides tools to upload and organize slides, make notes directly on them, and post questions.
iWebPhoto - This site is a free image hosting site that allows you to create slide shows for embedding and sharing with colleagues and students. The free membership includes five free slide shows with 50 photos each that can be linked to websites and blogs.
Sliderocket - Sliderocket offers 250MB of free storage for slide show presentation and creation. This site also allows you to import, organize, synchronize, and share your presentations.
Guest post from education writer Karen Schweitzer. Karen is the About.com Guide to Business School. She also writes about online degree programs for OnlineDegreePrograms.org.