Image Export converts PowerPoint slides to high-quality images.
PPT2HTML exports HTML even from PowerPoint 2010 and 2013, gives you full control of PowerPoint HTML output, helps meet Section 508 accessibility requirements
Merge Excel data into PowerPoint presentations to create certificates, awards presentations, personalized presentations and more
Resize your presentations quickly and without distortion
Language Selector switches the text in your presentation from one language to another
FixLinks prevents broken links when you distribute PowerPoint presentations
Shape Styles brings styles to PowerPoint. Apply complex formatting with a single click.
Prep4PDF preserves interactivity in PowerPoint presentations when you convert to PDF
Clocks and timers for PowerPoint
There's a timer for PowerPoint 2000 and above from Tushar Mehta
There's also a free AutoDateTime addin available at PowerPoint MVP Chirag Dalal's site
And a free Break Timer from PowerPoint MVP, Bill Foley
Or a way of doing the job with animation, courtesy of Geetesh Bajaj
Kees van der Meer sent us this very clever countdown timer that can be used on any slide and uses only animation to do its work (requires PowerPoint 2002 or later). Download it, run the slide show, then look at the animation settings to see how it's done.
A clever "one-slide" timer from Andrew May at Microsoft.
PowerPoint MVP John Wilson takes Andrew's method and automates it with a little VBA. The VBA is only used to create the duplicate animated shapes, and isn't required in the actual presentation, which will work even in the VBA-less Viewer.
And here's John's Animated GIF timer.
With a bit of VBA, you can Simulate a countdown timer using Sleep API thanks to Shyam Pillai.
Countdown Clock for Windows isn't specifically for PowerPoint, but may answer some needs better than PPT-specific soutions. Inexpensive shareware (approx. US$20)
Ellen Finkelstein has another variation
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